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/socket2/README.md

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+# Socket2
+
+Socket2 is a crate that provides utilities for creating and using sockets.
+
+The goal of this crate is to create and use a socket using advanced
+configuration options (those that are not available in the types in the standard
+library) without using any unsafe code.
+
+This crate provides as direct as possible access to the system's functionality
+for sockets, this means little effort to provide cross-platform utilities. It is
+up to the user to know how to use sockets when using this crate. *If you don't
+know how to create a socket using libc/system calls then this crate is not for
+you*. Most, if not all, functions directly relate to the equivalent system call
+with no error handling applied, so no handling errors such as `EINTR`. As a
+result using this crate can be a little wordy, but it should give you maximal
+flexibility over configuration of sockets.
+
+See the [API documentation] for more.
+
+[API documentation]: https://docs.rs/socket2
+
+# Two branches
+
+Currently Socket2 supports two versions: v0.4 and v0.3. Version 0.4 is developed
+in the master branch, version 0.3 in the [v0.3.x branch].
+
+[v0.3.x branch]: https://github.com/rust-lang/socket2/tree/v0.3.x
+
+# OS support
+
+Socket2 attempts to support the same OS/architectures as Rust does, see
+https://doc.rust-lang.org/nightly/rustc/platform-support.html. However this is
+not always possible, below is current list of support OSs.
+
+*If your favorite OS is not on the list consider contributing it! See [issue
+#78].*
+
+[issue #78]: https://github.com/rust-lang/socket2/issues/78
+
+### Tier 1
+
+These OSs are tested with each commit in the CI and must always pass the tests.
+All functions/types/etc., excluding ones behind the `all` feature, must work on
+these OSs.
+
+* Linux
+* macOS
+* Windows
+
+### Tier 2
+
+These OSs are currently build in the CI, but not tested. Not all
+functions/types/etc. may work on these OSs, even ones **not** behind the `all`
+feature flag.
+
+* Android
+* FreeBSD
+* Fuchsia
+* iOS
+* illumos
+* NetBSD
+* Redox
+* Solaris
+
+# Minimum Supported Rust Version (MSRV)
+
+Socket2 uses 1.46.0 as MSRV.
+
+# 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.
+
+### 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.