[clang] [libclang/python] Add LIBCLANG_LIBRARY_PATH and LIBCLANG_LIBRARY_FILE (PR #170201)

[Jannick Kremer via cfe-commits]

https://github.com/DeinAlptraum approved this pull request.

LGTM!

@Endilll if you have no further comments, I would merge this

https://github.com/llvm/llvm-project/pull/170201