Initial vendor packages

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

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+autocfg
+=======
+
+[![autocfg crate](https://img.shields.io/crates/v/autocfg.svg)](https://crates.io/crates/autocfg)
+[![autocfg documentation](https://docs.rs/autocfg/badge.svg)](https://docs.rs/autocfg)
+![minimum rustc 1.0](https://img.shields.io/badge/rustc-1.0+-red.svg)
+![build status](https://github.com/cuviper/autocfg/workflows/master/badge.svg)
+
+A Rust library for build scripts to automatically configure code based on
+compiler support.  Code snippets are dynamically tested to see if the `rustc`
+will accept them, rather than hard-coding specific version support.
+
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[build-dependencies]
+autocfg = "1"
+```
+
+Then use it in your `build.rs` script to detect compiler features.  For
+example, to test for 128-bit integer support, it might look like:
+
+```rust
+extern crate autocfg;
+
+fn main() {
+    let ac = autocfg::new();
+    ac.emit_has_type("i128");
+
+    // (optional) We don't need to rerun for anything external.
+    autocfg::rerun_path("build.rs");
+}
+```
+
+If the type test succeeds, this will write a `cargo:rustc-cfg=has_i128` line
+for Cargo, which translates to Rust arguments `--cfg has_i128`.  Then in the
+rest of your Rust code, you can add `#[cfg(has_i128)]` conditions on code that
+should only be used when the compiler supports it.
+
+
+## Release Notes
+
+- 1.1.0 (2022-02-07)
+  - Use `CARGO_ENCODED_RUSTFLAGS` when it is set.
+
+- 1.0.1 (2020-08-20)
+  - Apply `RUSTFLAGS` for more `--target` scenarios, by @adamreichold.
+
+- 1.0.0 (2020-01-08)
+  - 🎉 Release 1.0! 🎉 (no breaking changes)
+  - Add `probe_expression` and `emit_expression_cfg` to test arbitrary expressions.
+  - Add `probe_constant` and `emit_constant_cfg` to test arbitrary constant expressions.
+
+- 0.1.7 (2019-10-20)
+  - Apply `RUSTFLAGS` when probing `$TARGET != $HOST`, mainly for sysroot, by @roblabla.
+
+- 0.1.6 (2019-08-19)
+  - Add `probe`/`emit_sysroot_crate`, by @leo60228.
+
+- 0.1.5 (2019-07-16)
+  - Mask some warnings from newer rustc.
+
+- 0.1.4 (2019-05-22)
+  - Relax `std`/`no_std` probing to a warning instead of an error.
+  - Improve `rustc` bootstrap compatibility.
+
+- 0.1.3 (2019-05-21)
+  - Auto-detects if `#![no_std]` is needed for the `$TARGET`.
+
+- 0.1.2 (2019-01-16)
+  - Add `rerun_env(ENV)` to print `cargo:rerun-if-env-changed=ENV`.
+  - Add `rerun_path(PATH)` to print `cargo:rerun-if-changed=PATH`.
+
+
+## Minimum Rust version policy
+
+This crate's minimum supported `rustc` version is `1.0.0`.  Compatibility is
+its entire reason for existence, so this crate will be extremely conservative
+about raising this requirement.  If this is ever deemed necessary, it will be
+treated as a major breaking change for semver purposes.
+
+
+## License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.