fix(configure.ac): placed a guard for ubuntu multilib inclusion on presence only
fix(configure.ac): placed a guard for ubuntu multilib inclusion on presence only

rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix