[libclc] [libclc][NFC] Prioritize clang's built-in opencl-c-base.h over CPATH versions (PR #177754)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

I'd guess that it's just most of the time the clang resource directory headers have quite obtuse names and tend not to change much, so people don't notice.  I'm still curious who or what is setting `CPATH` here, because I'm leaning towards saying that we aren't responsible for working around non-standard user environments (Thought there are definitely plenty of places where we hack around things like this).

https://github.com/llvm/llvm-project/pull/177754