RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.

zeroidc/vendor/itertools/README.md

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+# Itertools
+
+Extra iterator adaptors, functions and macros.
+
+Please read the [API documentation here](https://docs.rs/itertools/).
+
+[![build_status](https://github.com/rust-itertools/itertools/actions/workflows/ci.yml/badge.svg)](https://github.com/rust-itertools/itertools/actions)
+[![crates.io](https://img.shields.io/crates/v/itertools.svg)](https://crates.io/crates/itertools)
+
+How to use with Cargo:
+
+```toml
+[dependencies]
+itertools = "0.10.2"
+```
+
+How to use in your crate:
+
+```rust
+use itertools::Itertools;
+```
+
+## How to contribute
+
+- Fix a bug or implement a new thing
+- Include tests for your new feature, preferably a QuickCheck test
+- Make a Pull Request
+
+For new features, please first consider filing a PR to [rust-lang/rust](https://github.com/rust-lang/rust),
+adding your new feature to the `Iterator` trait of the standard library, if you believe it is reasonable.
+If it isn't accepted there, proposing it for inclusion in ``itertools`` is a good idea.
+The reason for doing is this is so that we avoid future breakage as with ``.flatten()``.
+However, if your feature involves heap allocation, such as storing elements in a ``Vec<T>``,
+then it can't be accepted into ``libcore``, and you should propose it for ``itertools`` directly instead.
+
+## License
+
+Dual-licensed to be compatible with the Rust project.
+
+Licensed under the Apache License, Version 2.0
+https://www.apache.org/licenses/LICENSE-2.0 or the MIT license
+https://opensource.org/licenses/MIT, at your
+option. This file may not be copied, modified, or distributed
+except according to those terms.