Added more scripts to tidy check
auto merge of #12243 : dguenther/rust/extend-tidy, r=alexcrichton

Extends the license and formatting check to `*.js` files in `src/doc` and `*.sh`, `*.pl`, `*.c`, and `*.h` files in `src/etc`. As best as I could tell, these files should be covered under the Rust project license.

cc @brson: Do any other scripts need a license? I'd like to double-check that this PR closes #4534.