[libc-commits] [libc] [libc][cmake] reset COMPILE_DEFINITIONS (PR #77810)

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michaelrj-google wrote:

I would guess that the debug macro is being set based on the cmake flag `-DCMAKE_BUILD_TYPE=Debug`, and we might want to respect that in our build. Other than that this looks fine to me.

https://github.com/llvm/llvm-project/pull/77810