[libc-commits] [libc] [libc][POSIX][pthreads] implemented missing pthread_rwlockattr functions (PR #90249)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

@nickdesaulniers seems to be traveling. I will merge this according to previous approval.

https://github.com/llvm/llvm-project/pull/90249