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Not all architectures implement the wait4() syscall. It can be implemented in terms of the waitid() syscall, but that would require some rework of the other wait-related functions in wait.h. As wait4() is non-standard and deprecated, remove it. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-7-4b63f2caaa89@weissschuh.net