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Up to [DVB] / dietlibc / alpha

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

.text
.global __CAS
.type __CAS,@function
__CAS:
	mb
1:
	ldq_l $0,0($16)
	cmpeq $0,$17,$1
	beq $1,2f
	mov $18,$1
	stq_c $1,0($16)
	beq $1,1b
	mb
2:
	ret
.size __CAS, .-__CAS