extras/LinuxRPM: error in Makefile.am

Change-Id: I50de95ca6eff09338ce4a6f9f2b42aeccd10cae2
BUG: 1128192
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/8444
Reviewed-by: Lalatendu Mohanty <lmohanty@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>