The check-installed-headers tests show up that the Alpha <sys/user.h>
is not self-contained, using size_t without including any header that
defines it. This patch fixes it by including <stddef.h>, as done for
other architectures' versions of this header.
Tested for Alpha (compilation only).
* sysdeps/unix/sysv/linux/alpha/sys/user.h: Include <stddef.h>.
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