[libcxx-commits] [libcxx] [libcxx] Set `_LIBCPP_HAS_CLOCK_GETTIME` for GPU targets (PR #99243)

[Louis Dionne via libcxx-commits]

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

I am not a huge fan of these checks, but they are self-contained and only in the dylib. And there's obvious precedent for using the exact same approach. So LGTM.

https://github.com/llvm/llvm-project/pull/99243