[libc-commits] [libc] [libc] Add Darwin mutex support via os_sync primitives (PR #167722)

[Shreeyash Pandey via libc-commits]

bojle wrote:

@SchrodingerZhu I've added a small change to (libc/src/__support/File/file.h) tangential to the PR but necessary for CI to pass. Let me know what you think. If this should be moved to another PR, I can do that too. 

https://github.com/llvm/llvm-project/pull/167722