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/js-sys/index.md

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+# `js-sys`
+
+The [`js-sys` crate][js-sys] provides raw bindings to all the global APIs
+guaranteed to exist in every JavaScript environment by the ECMAScript standard,
+and its source lives at [`wasm-bindgen/crates/js-sys`][src].  With the `js-sys`
+crate, we can work with `Object`s, `Array`s, `Function`s, `Map`s, `Set`s,
+etc... without writing the `#[wasm_bindgen]` imports by hand.
+
+Documentation for the published version of this crate is available on
+[docs.rs][docsrs] but you can also check out the [master branch
+documentation][masterdoc] for the crate.
+
+[docsrs]: https://docs.rs/js-sys
+[masterdoc]: https://rustwasm.github.io/wasm-bindgen/api/js_sys/
+[src]: https://github.com/rustwasm/wasm-bindgen/tree/master/crates/js-sys
+
+For example, we can invoke JavaScript [`Function`][mdn-function] callbacks and
+time how long they take to execute with [`Date.now()`][mdn-date-now], and we
+don't need to write any JS imports ourselves:
+
+```rust
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub fn timed(callback: &js_sys::Function) -> f64 {
+    let then = js_sys::Date::now();
+    callback.apply(JsValue::null(), &js_sys::Array::new()).unwrap();
+    let now = js_sys::Date::now();
+    now - then
+}
+```
+
+The `js-sys` crate doesn't contain bindings to any Web APIs like
+[`document.querySelectorAll`][mdn-qsa]. These will be part of the
+[`web-sys`][web-sys] crate.
+
+[MDN]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
+[js-sys]: https://crates.io/crates/js-sys
+[issue]: https://github.com/rustwasm/wasm-bindgen/issues/275
+[mdn-function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function
+[mdn-qsa]: https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll
+[web-sys]: https://crates.io/crates/web-sys
+[web-sys-contributing]: https://rustwasm.github.io/wasm-bindgen/web-sys.html
+[web-sys-issues]: https://github.com/rustwasm/wasm-bindgen/issues?q=is%3Aissue+is%3Aopen+label%3Aweb-sys
+[mdn-date-now]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now