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C23 adds once_flag, ONCE_FLAG_INIT and call_once to stdlib.h (in C11 they were only in threads.h, in C23 they are in both headers; this change came from N2840). Implement this change, with a bits/types/once_flag.h header for the common type and initializer definitions. Note that there's an omnibus bug (bug 33001) that covers more than just these missing definitions. This doesn't seem a significant enough feature to be worth mentioning in NEWS. ISO C is not concerned with whether functions are in libc or libpthread, but POSIX links this to what header they are declared in, so functions declared in stdlib.h are supposed to be in libc. However, the current edition of POSIX is based on C17; hopefully Hurd glibc will have completed the merge of libpthread into libc (in particular, moving call_once) well before a future edition of POSIX based on C23 (or a later version of ISO C) is released. Tested for x86_64 and x86.