2d35ed2d49
Add bindings for `CFFileDescriptor` This pull request adds implementation of `CFFileDescriptor` and `CFRunLoopSource` related API. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-foundation-rs/84) <!-- Reviewable:end -->