[libc-commits] [libc] [libc][NFC] Refactor FLAGS expansion using cmake_language(CALL ...). (PR #80156)

[Joseph Huber via libc-commits]

https://github.com/jhuber6 approved this pull request.

Worked on the GPU build at least. Lots of CMake changes but it seems to be mostly the same behaviour.

https://github.com/llvm/llvm-project/pull/80156