[libclc] [libclc] Set OpenCL C version for each target (PR #135733)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

I'd expect the libclc build (or any other runtime support library) to consistently use the same language version independent of the target. If the target doesn't support that version (which IIRC isn't actually a hard error anywhere) and fails to compile on some feature, those should be carved out into separate version dependent build (as in, this isn't a compile target property but a specific build target property)

https://github.com/llvm/llvm-project/pull/135733