Automatically detect libclang version when testing
Automatically detect libclang version when testing

Automatically detect libclang version when testing and use approppriate
expectation files. Ref issue #794.

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