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

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

oops, meant to remove the changes to mmap.{c|h}. Removed.  We only need changes to the cmake.

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