Initial vendor packages

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

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+# flate2
+
+[![Crates.io](https://img.shields.io/crates/v/flate2.svg?maxAge=2592000)](https://crates.io/crates/flate2)
+[![Documentation](https://docs.rs/flate2/badge.svg)](https://docs.rs/flate2)
+
+A streaming compression/decompression library DEFLATE-based streams in Rust.
+
+This crate by default uses the `miniz_oxide` crate, a port of `miniz.c` to pure
+Rust. This crate also supports other [backends](#backends), such as the widely
+available zlib library or the high-performance zlib-ng library.
+
+Supported formats:
+
+* deflate
+* zlib
+* gzip
+
+```toml
+# Cargo.toml
+[dependencies]
+flate2 = "1.0"
+```
+
+## MSRV (Minimum Supported Rust Version) Policy
+
+This crate supports the current stable and the last stable for the latest version.
+For example, if the current stable is 1.64, this crate supports 1.64 and 1.63.
+Older stables may work, but we don't guarantee these will continue to work.
+
+## Compression
+
+```rust
+use std::io::prelude::*;
+use flate2::Compression;
+use flate2::write::ZlibEncoder;
+
+fn main() {
+    let mut e = ZlibEncoder::new(Vec::new(), Compression::default());
+    e.write_all(b"foo");
+    e.write_all(b"bar");
+    let compressed_bytes = e.finish();
+}
+```
+
+## Decompression
+
+```rust,no_run
+use std::io::prelude::*;
+use flate2::read::GzDecoder;
+
+fn main() {
+    let mut d = GzDecoder::new("...".as_bytes());
+    let mut s = String::new();
+    d.read_to_string(&mut s).unwrap();
+    println!("{}", s);
+}
+```
+
+## Backends
+
+The default `miniz_oxide` backend has the advantage of being pure Rust. If you
+want maximum performance, you can use the zlib-ng C library:
+
+```toml
+[dependencies]
+flate2 = { version = "1.0.17", features = ["zlib-ng"], default-features = false }
+```
+
+Note that the `"zlib-ng"` feature works even if some other part of your crate
+graph depends on zlib.
+
+However, if you're already using another C or Rust library that depends on
+zlib, and you want to avoid including both zlib and zlib-ng, you can use that
+for Rust code as well:
+
+```toml
+[dependencies]
+flate2 = { version = "1.0.17", features = ["zlib"], default-features = false }
+```
+
+Or, if you have C or Rust code that depends on zlib and you want to use zlib-ng
+via libz-sys in zlib-compat mode, use:
+
+```toml
+[dependencies]
+flate2 = { version = "1.0.17", features = ["zlib-ng-compat"], default-features = false }
+```
+
+Note that when using the `"zlib-ng-compat"` feature, if any crate in your
+dependency graph explicitly requests stock zlib, or uses libz-sys directly
+without `default-features = false`, you'll get stock zlib rather than zlib-ng.
+See [the libz-sys
+README](https://github.com/rust-lang/libz-sys/blob/main/README.md) for details.
+To avoid that, use the `"zlib-ng"` feature instead.
+
+For compatibility with previous versions of `flate2`, the Cloudflare optimized
+version of zlib is available, via the `cloudflare_zlib` feature. It's not as
+fast as zlib-ng, but it's faster than stock zlib. It requires an x86-64 CPU with
+SSE 4.2 or ARM64 with NEON & CRC. It does not support 32-bit CPUs at all and is
+incompatible with mingw. For more information check the [crate
+documentation](https://crates.io/crates/cloudflare-zlib-sys). Note that
+`cloudflare_zlib` will cause breakage if any other crate in your crate graph
+uses another version of zlib/libz.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   https://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   https://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this project by you, as defined in the Apache-2.0 license,
+shall be dual licensed as above, without any additional terms or conditions.