CMake: Search for Clang in CMAKE_LIBRARY_PATH, CMAKE_PREFIX_PATH, and CMAKE_FRAMEWORK_PATH

On some systems (esp. systems that use unique hashed file-paths for
library-versions like Nix), we can't expect LLVM and Clang to share
lib/bin directories.

The best we can do is find the matching clang libraries in the
CMAKE_LIBRARY_PATH provided by the environment
abc1ae538fCody Tapscott committed on 7/25/2022, 5:38:52 PMparent5337934
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