build: do not distribute precompiled cpopen.so

Change-Id: I45058a8d2c9c1824f812d16772ad98cfbcc92692
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17189
Tested-by: Eyal Edri <eedri@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>