This fixes the following make rpm warning:

warning: Installed (but unpackaged) file(s) found:
   /usr/lib64/libvirt/connection-driver/libvirt_driver_nwfilter.so.0
   /usr/lib64/libvirt/connection-driver/libvirt_driver_nwfilter.so.0.0.0

introduced in comit 8d559864Signed-off-by: NDwight Engen <dwight.engen@oracle.com>
Signed-off-by: NEric Blake <eblake@redhat.com>