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/wasm-bindgen/guide/src/contributing/web-sys/overview.md

@@ -0,0 +1,44 @@
+# `web-sys` Overview
+
+The `web-sys` crate has this file and directory layout:
+
+```text
+.
+├── build.rs
+├── Cargo.toml
+├── README.md
+├── src
+│   └── lib.rs
+└── webidls
+    └── enabled
+        └── ...
+```
+
+### `webidls/enabled/*.webidl`
+
+These are the WebIDL interfaces that we will actually generate bindings for (or
+at least bindings for *some* of the things defined in these files).
+
+### `build.rs`
+
+The `build.rs` invokes `wasm-bindgen`'s WebIDL frontend on all the WebIDL files
+in `webidls/enabled`. It writes the resulting bindings into the cargo build's
+out directory.
+
+### `src/lib.rs`
+
+The only thing `src/lib.rs` does is include the bindings generated at compile
+time in `build.rs`. Here is the whole `src/lib.rs` file:
+
+```rust
+{{#include ../../../../crates/web-sys/src/lib.rs}}
+```
+
+### Cargo features
+
+When compiled the crate is almost empty by default, which probably isn't what
+you want! Due to the very large number of APIs, this crate uses features to
+enable portions of its API to reduce compile times. The list of features in
+`Cargo.toml` all correspond to types in the generated functions. Enabling a
+feature enables that type. All methods should indicate what features need to be
+activated to use the method.