Extracted the simple_pv library out of the zmq_stream area.
simple_pv was written to support zmq, but is used by other streams and does not require zmq. This change moves it to its own area and makes sure it is always built, even when zmq is not found. Also removed an unneeded header from dix_xmit.c. Its presence was noticed when the includes changed for the simple_pv move.
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