[Openmp-commits] [openmp] [openmp][NFC] Fix a warning when built with clang (PR #155426)

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c8ef wrote:

> I think the warning is stupid, I would rather keep the default case and disable the warning.

Maybe we should use this: https://github.com/llvm/llvm-project/blob/5faed1ad84c44b0093ee32c07dc39b33ea674ca1/openmp/runtime/cmake/LibompHandleFlags.cmake#L37

https://github.com/llvm/llvm-project/pull/155426