options/posix: fix sys_futex_wait handling and fix an issue in pthread_once #1068
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Some places don't handle a signal interruption in sys_futex_wait properly.
Also, pthread_once not only doesn't handle an EINTR but also doesn't handle an EAGAIN. This could mean there would be a tiny window where the function would complete and __mlibc_done would change but the thread wouldn't be sleeping. On return, that would cause a panic as EAGAIN was considered an error.