Fix improperly quoted PKG_CHECK_MODULES parameters.

Change-Id: I11765fd1a25058b84fc32249ea745abefbade3f9
BUG: 920372
Signed-off-by: Justin Clift <jclift@redhat.com>
Reviewed-on: http://review.gluster.org/4652
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>