Update.

Update.

	* misc/sys/cdefs.h: Define __restrict_arr.
	* include/sys/time.h: Add restrict where required by AGd4.
	* inet/arpa/inet.h: Likewise.
	* io/sys/stat.h: Likewise.
	* io/sys/statvfs.h: Likewise.
	* misc/search.h: Likewise.
	* misc/sys/select.h: Likewise.
	* posix/glob.h: Likewise.
	* posix/regex.h: Likewise.
	* posix/spawn.h: Likewise.
	* posix/unistd.h: Likewise.
	* rt/aio.h: Likewise.
	* signal/signal.h: Likewise.
	* socket/sys/socket.h: Likewise.
	* stdlib/ucontext.h: Likewise.
	* streams/stropts.h: Likewise.
	* string/string.h: Likewise.
	* time/time.h: Likewise.
	* time/sys/time.h: Likewise.

	* posix/spawn.h: Add declarations for posix_spawnattr_getscheparam
	and posix_spawnattr_setscheparam.

	* libio/stdio.h: Make cuserid prototype again available for all
	XPG versions.