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/examples/wasm-in-web-worker.md

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+# WASM in Web Worker
+
+[View full source code][code]
+
+[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/wasm-in-web-worker
+
+A simple example of parallel execution by spawning a web worker with `web_sys`,
+loading WASM code in the web worker and interacting between the main thread and
+the worker.
+
+## Building & compatibility
+
+At the time of this writing, only Chrome supports modules in web workers, e.g.
+Firefox does not. To have compatibility across browsers, the whole example is
+set up without relying on ES modules as target. Therefore we have to build
+with `--target no-modules`. The full command can be found in `build.sh`.
+
+## `Cargo.toml`
+
+The `Cargo.toml` enables features necessary to work with the DOM, log output to
+the JS console, creating a worker and reacting to message events.
+
+```toml
+{{#include ../../../examples/wasm-in-web-worker/Cargo.toml}}
+```
+
+## `src/lib.rs`
+
+Creates a struct `NumberEval` with methods to act as stateful object in the
+worker and function `startup` to be launched in the main thread. Also includes
+internal helper functions `setup_input_oninput_callback` to attach a
+`wasm_bindgen::Closure` as callback to the `oninput` event of the input field
+and `get_on_msg_callback` to create a `wasm_bindgen::Closure` which is triggered
+when the worker returns a message.
+
+```rust
+{{#include ../../../examples/wasm-in-web-worker/src/lib.rs}}
+```
+
+## `index.html`
+
+Includes the input element `#inputNumber` to type a number into and a HTML
+element `#resultField` were the result of the evaluation even/odd is written to.
+Since we require to build with `--target no-modules` to be able to load WASM
+code in in the worker across browsers, the `index.html` also includes loading
+both `wasm_in_web_worker.js` and `index.js`.
+
+```html
+{{#include ../../../examples/wasm-in-web-worker/www/index.html}}
+```
+
+## `index.js`
+
+Loads our WASM file asynchronously and calls the entry point `startup` of the
+main thread which will create a worker.
+
+```js
+{{#include ../../../examples/wasm-in-web-worker/www/index.js}}
+```
+
+## `worker.js`
+
+Loads our WASM file by first importing `wasm_bindgen` via
+`importScripts('./pkg/wasm_in_web_worker.js')` and then awaiting the Promise
+returned by `wasm_bindgen(...)`. Creates a new object to do the background
+calculation and bind a method of the object to the `onmessage` callback of the
+worker.
+
+```js
+{{#include ../../../examples/wasm-in-web-worker/www/worker.js}}
+```