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This patch does:
	- consolidate the three implementations of compat_sys_waitid
	  (some were called sys32_waitid).
	- adds sys_waitid syscall to ppc
	- adds sys_waitid and compat_sys_waitid syscalls to ppc64

I have left PARISC and MIPS to their own devices (by request).
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>