Let the libclang version being tested be implicit
Let the libclang version being tested be implicit

Our test runner is smart enough to figure out which test expectations to use
now.

emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen