Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+<div align="center">
+  <h1><code>rustix</code></h1>
+
+  <p>
+    <strong>Safe Rust bindings to POSIX/Unix/Linux/Winsock syscalls</strong>
+  </p>
+
+  <strong>A <a href="https://bytecodealliance.org/">Bytecode Alliance</a> project</strong>
+
+  <p>
+    <a href="https://github.com/bytecodealliance/rustix/actions?query=workflow%3ACI"><img src="https://github.com/bytecodealliance/rustix/workflows/CI/badge.svg" alt="Github Actions CI Status" /></a>
+    <a href="https://bytecodealliance.zulipchat.com/#narrow/stream/206238-general"><img src="https://img.shields.io/badge/zulip-join_chat-brightgreen.svg" alt="zulip chat" /></a>
+    <a href="https://crates.io/crates/rustix"><img src="https://img.shields.io/crates/v/rustix.svg" alt="crates.io page" /></a>
+    <a href="https://docs.rs/rustix"><img src="https://docs.rs/rustix/badge.svg" alt="docs.rs docs" /></a>
+  </p>
+</div>
+
+`rustix` provides efficient memory-safe and [I/O-safe] wrappers to POSIX-like,
+Unix-like, Linux, and Winsock syscall-like APIs, with configurable backends.
+It uses Rust references, slices, and return values instead of raw pointers, and
+[I/O safety types] instead of raw file descriptors, providing memory safety,
+[I/O safety], and [provenance]. It uses `Result`s for reporting errors,
+[`bitflags`] instead of bare integer flags, an [`Arg`] trait with optimizations
+to efficiently accept any Rust string type, and several other efficient
+conveniences.
+
+`rustix` is low-level and, and while the `net` API supports [Windows Sockets 2]
+(Winsock), the rest of the APIs do not support Windows; for higher-level and
+more portable APIs built on this functionality, see the [`cap-std`], [`memfd`],
+[`timerfd`], and [`io-streams`] crates, for example.
+
+`rustix` currently has two backends available:
+
+ * linux_raw, which uses raw Linux system calls and vDSO calls, and is
+   supported on Linux on x86-64, x86, aarch64, riscv64gc, powerpc64le,
+   arm (v5 onwards), mipsel, and mips64el, with stable, nightly, and 1.63 Rust.
+    - By being implemented entirely in Rust, avoiding `libc`, `errno`, and pthread
+      cancellation, and employing some specialized optimizations, most functions
+      compile down to very efficient code, which can often be fully inlined into
+      user code.
+    - Most functions in `linux_raw` preserve memory, I/O safety, and pointer
+      provenance all the way down to the syscalls.
+
+ * libc, which uses the [`libc`] crate which provides bindings to native `libc`
+   libraries on Unix-family platforms, and [`windows-sys`] for Winsock on
+   Windows, and is portable to many OS's.
+
+The linux_raw backend is enabled by default on platforms which support it. To
+enable the libc backend instead, either enable the "use-libc" cargo feature,
+or set the `RUSTFLAGS` environment variable to `--cfg=rustix_use_libc` when
+building.
+
+## Cargo features
+
+The modules [`rustix::io`], [`rustix::fd`], and [`rustix::ffi`] are enabled
+by default. The rest of the API is conditional with cargo feature flags:
+
+| Name       | Description                                                    |
+| ---------- | -------------------------------------------------------------- |
+| `event`    | [`rustix::event`]—Polling and event operations.                |
+| `fs`       | [`rustix::fs`]—Filesystem operations.                          |
+| `io_uring` | [`rustix::io_uring`]—Linux io_uring.                           |
+| `mm`       | [`rustix::mm`]—Memory map operations.                          |
+| `mount`    | [`rustix::mount`]—Linux mount API.                             |
+| `net`      | [`rustix::net`]—Network-related operations.                    |
+| `param`    | [`rustix::param`]—Process parameters.                          |
+| `pipe`     | [`rustix::pipe`]—Pipe operations.                              |
+| `process`  | [`rustix::process`]—Process-associated operations.             |
+| `procfs`   | [`rustix::procfs`]—Utilities for reading `/proc` on Linux.     |
+| `pty`      | [`rustix::pty`]—Pseudoterminal operations.                     |
+| `rand`     | [`rustix::rand`]—Random-related operations.                    |
+| `shm`      | [`rustix::shm`]—POSIX shared memory.                           |
+| `stdio`    | [`rustix::stdio`]—Stdio-related operations.                    |
+| `system`   | [`rustix::system`]—System-related operations.                  |
+| `termios`  | [`rustix::termios`]—Terminal I/O stream operations.            |
+| `thread`   | [`rustix::thread`]—Thread-associated operations.               |
+| `time`     | [`rustix::time`]—Time-related operations.                      |
+|            |                                                                |
+| `use-libc` | Enable the libc backend.                                       |
+
+[`rustix::event`]: https://docs.rs/rustix/*/rustix/event/index.html
+[`rustix::fs`]: https://docs.rs/rustix/*/rustix/fs/index.html
+[`rustix::io_uring`]: https://docs.rs/rustix/*/rustix/io_uring/index.html
+[`rustix::mm`]: https://docs.rs/rustix/*/rustix/mm/index.html
+[`rustix::mount`]: https://docs.rs/rustix/*/rustix/mount/index.html
+[`rustix::net`]: https://docs.rs/rustix/*/rustix/net/index.html
+[`rustix::param`]: https://docs.rs/rustix/*/rustix/param/index.html
+[`rustix::pipe`]: https://docs.rs/rustix/*/rustix/pipe/index.html
+[`rustix::process`]: https://docs.rs/rustix/*/rustix/process/index.html
+[`rustix::procfs`]: https://docs.rs/rustix/*/rustix/procfs/index.html
+[`rustix::pty`]: https://docs.rs/rustix/*/rustix/pty/index.html
+[`rustix::rand`]: https://docs.rs/rustix/*/rustix/rand/index.html
+[`rustix::shm`]: https://docs.rs/rustix/*/rustix/shm/index.html
+[`rustix::stdio`]: https://docs.rs/rustix/*/rustix/stdio/index.html
+[`rustix::system`]: https://docs.rs/rustix/*/rustix/system/index.html
+[`rustix::termios`]: https://docs.rs/rustix/*/rustix/termios/index.html
+[`rustix::thread`]: https://docs.rs/rustix/*/rustix/thread/index.html
+[`rustix::time`]: https://docs.rs/rustix/*/rustix/time/index.html
+[`rustix::io`]: https://docs.rs/rustix/*/rustix/io/index.html
+[`rustix::fd`]: https://docs.rs/rustix/*/rustix/fd/index.html
+[`rustix::ffi`]: https://docs.rs/rustix/*/rustix/ffi/index.html
+
+## 64-bit Large File Support (LFS) and Year 2038 (y2038) support
+
+`rustix` automatically uses 64-bit APIs when available, and avoids exposing
+32-bit APIs that would have the year-2038 problem or fail to support large
+files. For instance, `rustix::fstatvfs` calls `fstatvfs64`, and returns a
+struct that's 64-bit even on 32-bit platforms.
+
+## Similar crates
+
+`rustix` is similar to [`nix`], [`simple_libc`], [`unix`], [`nc`], [`uapi`],
+and [`rusl`]. `rustix` is architected for [I/O safety] with most APIs using
+[`OwnedFd`] and [`AsFd`] to manipulate file descriptors rather than `File` or
+even `c_int`, and supporting multiple backends so that it can use direct
+syscalls while still being usable on all platforms `libc` supports. Like `nix`,
+`rustix` has an optimized and flexible filename argument mechanism that allows
+users to use a variety of string types, including non-UTF-8 string types.
+
+[`relibc`] is a similar project which aims to be a full "libc", including
+C-compatible interfaces and higher-level C/POSIX standard-library
+functionality; `rustix` just aims to provide safe and idiomatic Rust interfaces
+to low-level syscalls. `relibc` also doesn't tend to support features not
+supported on Redox, such as `*at` functions like `openat`, which are important
+features for `rustix`.
+
+`rustix` has its own code for making direct syscalls, similar to the
+[`syscall`], [`sc`], and [`scall`] crates, using the Rust `asm!` macro.
+`rustix` can also use Linux's vDSO mechanism to optimize Linux `clock_gettime`
+on all architectures, and all Linux system calls on x86. And `rustix`'s
+syscalls report errors using an optimized `Errno` type.
+
+`rustix`'s `*at` functions are similar to the [`openat`] crate, but `rustix`
+provides them as free functions rather than associated functions of a `Dir`
+type. `rustix`'s `CWD` constant exposes the special `AT_FDCWD` value in a safe
+way, so users don't need to open `.` to get a current-directory handle.
+
+`rustix`'s `openat2` function is similar to the [`openat2`] crate, but uses I/O
+safety types rather than `RawFd`. `rustix` does not provide dynamic feature
+detection, so users must handle the [`NOSYS`] error themselves.
+
+`rustix`'s `termios` module is similar to the [`termios`] crate, but uses I/O
+safety types rather than `RawFd`, and the flags parameters to functions such as
+`tcsetattr` are `enum`s rather than bare integers. And, rustix calls its
+`tcgetattr` function `tcgetattr`, rather than `Termios::from_fd`.
+
+## Minimum Supported Rust Version (MSRV)
+
+This crate currently works on the version of [Rust on Debian stable], which is
+currently [Rust 1.63]. This policy may change in the future, in minor version
+releases, so users using a fixed version of Rust should pin to a specific
+version of this crate.
+
+## Minimum Linux Version
+
+On Linux platforms, rustix requires at least Linux 3.2. This is at most the
+oldest Linux version supported by:
+ - [any current Rust target], or
+ - [kernel.org] at the time of rustix's [MSRV] release.
+The specifics of this policy may change in the future, but we intend it to
+always reflect “very old” Linux versions.
+
+[MSRV]: #minimum-supported-rust-version-msrv
+[Rust 1.63]: https://blog.rust-lang.org/2022/08/11/Rust-1.63.0.html
+[any current Rust target]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
+[kernel.org]: https://www.kernel.org/releases.html
+[Rust on Debian stable]: https://packages.debian.org/stable/rust/rustc
+[Windows Sockets 2]: https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-start-page-2
+[`nix`]: https://crates.io/crates/nix
+[`unix`]: https://crates.io/crates/unix
+[`nc`]: https://crates.io/crates/nc
+[`simple_libc`]: https://crates.io/crates/simple_libc
+[`uapi`]: https://crates.io/crates/uapi
+[`rusl`]: https://lib.rs/crates/rusl
+[`relibc`]: https://gitlab.redox-os.org/redox-os/relibc
+[`syscall`]: https://crates.io/crates/syscall
+[`sc`]: https://crates.io/crates/sc
+[`scall`]: https://crates.io/crates/scall
+[`openat`]: https://crates.io/crates/openat
+[`openat2`]: https://crates.io/crates/openat2
+[I/O safety types]: https://doc.rust-lang.org/stable/std/os/fd/index.html#structs
+[`termios`]: https://crates.io/crates/termios
+[`libc`]: https://crates.io/crates/libc
+[`windows-sys`]: https://crates.io/crates/windows-sys
+[`cap-std`]: https://crates.io/crates/cap-std
+[`memfd`]: https://crates.io/crates/memfd
+[`timerfd`]: https://crates.io/crates/timerfd
+[`io-streams`]: https://crates.io/crates/io-streams
+[`bitflags`]: https://crates.io/crates/bitflags
+[`Arg`]: https://docs.rs/rustix/*/rustix/path/trait.Arg.html
+[I/O-safe]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
+[I/O safety]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
+[provenance]: https://github.com/rust-lang/rust/issues/95228
+[`OwnedFd`]: https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html
+[`AsFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsFd.html
+[`NOSYS`]: https://docs.rs/rustix/*/rustix/io/struct.Errno.html#associatedconstant.NOSYS