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Up to [DVB] / dietlibc / i386

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

.text
.global __CAS
.type __CAS,@function
__CAS:
	movl 4(%esp), %edx
	movl 8(%esp), %eax
	movl 12(%esp), %ecx
	lock cmpxchgl %ecx, (%edx)
	ret
.size __CAS, .-__CAS