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/hello-world.md

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+# Hello, World!
+
+[View full source code][code] or [view the compiled example online][online]
+
+[online]: https://rustwasm.github.io/wasm-bindgen/exbuild/hello_world/
+[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/hello_world
+
+This is the "Hello, world!" example of `#[wasm_bindgen]` showing how to set up
+a project, export a function to JS, call it from JS, and then call the `alert`
+function in Rust.
+
+## `Cargo.toml`
+
+The `Cargo.toml` lists the `wasm-bindgen` crate as a dependency.
+
+Also of note is the `crate-type = ["cdylib"]` which is largely used for wasm
+final artifacts today.
+
+```toml
+{{#include ../../../examples/hello_world/Cargo.toml}}
+```
+
+## `src/lib.rs`
+
+Here we define our Rust entry point along with calling the `alert` function.
+
+```rust
+{{#include ../../../examples/hello_world/src/lib.rs}}
+```
+
+## `index.js`
+
+Our JS entry point is quite small!
+
+```js
+{{#include ../../../examples/hello_world/index.js}}
+```
+
+## Webpack-specific files
+
+> **Note**: Webpack is not required for this example, and if you're interested
+> in options that don't use a JS bundler [see other examples][wab].
+
+[wab]: without-a-bundler.html
+
+And finally here's the Webpack configuration and `package.json` for this
+project:
+
+**webpack.config.js**
+
+```js
+{{#include ../../../examples/hello_world/webpack.config.js}}
+```
+
+**package.json**
+
+```json
+{{#include ../../../examples/hello_world/package.json}}
+```