Make fixes and improvements

- Introduce __assert_disable global
- Improve strsignal() thread safety
- Make system call tracing thread safe
- Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows
- Refactor DescribeFoo() functions into one place
- Fix fork() on Windows when TLS and MAP_STACK exist
- Round upwards in setsockopt(SO_RCVTIMEO) on Windows
- Disable futexes on OpenBSD which seem extremely broken
- Implement a better kludge for monotonic time on Windows

libc/intrin/movefileex.c

@@ -35,6 +35,6 @@ textwindows bool32 MoveFileEx(const char16_t *lpExistingFileName,
   ok = __imp_MoveFileExW(lpExistingFileName, lpNewFileName, dwFlags);
   if (!ok) __winerr();
   NTTRACE("MoveFileEx(%#hs, %#hs, %s) → %hhhd% m", lpExistingFileName,
-          lpNewFileName, DescribeNtMoveFileInputFlags(dwFlags), ok);
+          lpNewFileName, DescribeNtMovFileInpFlags(dwFlags), ok);
   return ok;
 }