Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+[![Coverage](https://img.shields.io/badge/dynamic/json?color=brightgreen&label=coverage&query=%24.data%5B0%5D.totals.lines.percent&suffix=%25&url=https%3A%2F%2Fraw.githubusercontent.com%2Fflip1995%2Frustc-semver%2Fgh-pages%2Fcov.json)](https://flip1995.github.io/rustc-semver/)
+[![Tests](https://github.com/flip1995/rustc-semver/workflows/Tests/badge.svg)](https://github.com/flip1995/rustc-semver/actions?query=branch%3Amaster+event%3Apush+workflow%3ATests)
+
+# Rustc Semver
+
+This crate provides a minimalistic parser for Rust versions.
+
+## Description
+
+The parser will only accept Versions in the form
+
+```text
+<major>.<minor>.<patch>
+```
+
+and 3 special versions:
+
+- `1.0.0-alpha`
+- `1.0.0-alpha.2`
+- `1.0.0-beta`
+
+This covers every version of `rustc` that were released to date.
+
+## Usage
+
+There are 2 functions to create a `RustcVersion`:
+
+1. `const RustcVersion::new(u32, u32, u32)`: This is mainly used to create
+   constants
+2. `RustcVersion::parse(&str)`: Usually you want to parse a version with this
+   function
+
+If you have a `RustcVersion` you can compare them, like you would expect:
+
+```rust
+assert!(RustcVersion::parse("1.42.0")? < RustcVersion::parse("1.43")?);
+```
+
+If you want to check whether one version meets another version according to the
+[Caret Requirements], there is the method `RustcVersion::meets`:
+
+```rust
+assert!(RustcVersion::new(1, 48, 0).meets(RustcVersion::parse("1.42")?));
+```
+
+[Caret Requirements]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#caret-requirements
+
+## Code of Conduct
+
+This repository adopts the [Contributor Covenant Code of
+Conduct](https://www.contributor-covenant.org/version/1/4/code-of-conduct/)
+
+## License
+
+Copyright 2020 Philipp Krones
+
+Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+https://www.apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+https://opensource.org/licenses/MIT>, at your option. Files in the project may
+not be copied, modified, or distributed except according to those terms.