rust_bindgen_library does not allow extra deps

Attempting to pass additional deps to rust_bindgen_library fails with `Error in rust_library: rule(...) got multiple values for parameter 'deps'`. It seems like the libc crate is almost certainly a requirement for nontrivial uses of `rust_bindgen_library`, so it's not clear how this rule is intended to be used without the ability to pass along additional deps.

Start by reproducing the reported rust_bindgen_library invocation and trace how it delegates to rust_library, focusing on where the deps parameter is passed. Done means additional dependencies can be supplied without the duplicate-deps error and a nontrivial binding that needs libc can be used successfully.

Written by the indexing model from the issue text.