Allow our Makefile to pass through added flags to be applied just to
the driver module and not the XvMC libraries.

diff --git a/src/Makefile.am b/src/Makefile.am
index 9bac9e9..7f8b13e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -32,6 +32,7 @@ CONFIG_CLEAN_FILES= version.h
 AM_CFLAGS = @XORG_CFLAGS@ @LIBUDEV_CFLAGS@ @DRI_CFLAGS@
 openchrome_drv_la_LTLIBRARIES = openchrome_drv.la
 openchrome_drv_la_LDFLAGS = -module -avoid-version @LIBUDEV_LIBS@
+openchrome_drv_la_LDFLAGS += $(openchrome_drv_la_LDFLAGS_add)
 openchrome_drv_ladir = @moduledir@/drivers
 
 openchrome_drv_la_SOURCES = \