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Up to [DVB] / dietlibc / ppc

  various build fixes, add sys/atomic.h and the __CAS function

.text
.global __CAS
.type __CAS, @function
__CAS:
	mr 9,3
	lwsync
1:
	lwarx 3,0,9
	cmpw 0,3,4
	bnelr- 0
	stwcx. 5,0,9
	bne- 0,1b
	isync
	blr
.size __CAS, .-__CAS