[libcxx-commits] [libcxx] [libc++] Use public os_sync API instead of private __ulock on newer Apple platforms (PR #202519)

[Louis Dionne via libcxx-commits]

ldionne wrote:

@huixie90 Should we be passing `ULF_NO_ERRNO` to both `__ulock_wake` and `os_sync_wake_by_address` then?

https://github.com/llvm/llvm-project/pull/202519