[libc-commits] [libc] [libc] Define _POSIX_THREADS and support _SC_THREADS in sysconf (PR #201091)

[Pavel Labath via libc-commits]

https://github.com/labath commented:

How did you pick value for _POSIX_THREADS? The latest [posix spec version](https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/unistd.h.html) wants this to be 202405L

https://github.com/llvm/llvm-project/pull/201091