spec: Don't depend on unreleased RPMs.

The requested package is not yet available in RHEL and will only be
available in 6.5.

Change-Id: I4a753dd4fdb8f32e53ac3231b37c60fbafeb82b3
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21385
Tested-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>