Fix integer overflow in sysdeps/unix/sysv/linux/bits/sched.h

	[BZ #15448]
	* sysdeps/unix/sysv/linux/bits/sched.h (__CPU_SET_S)
	(__CPU_CLR_S, __CPU_ISSET_S): Avoid integer overflow.
Hurd: add ST_NOATIME
Add getgid.c for SH

	[BZ #12387]
	* sysdeps/unix/sysv/linux/sh/getgid.c: New file.