package/multimedia/gstreamer/gstreamer.mk: Fix missing \

Fix stupid typo.

Signed-off-by: Daniel Laird <daniel.j.laird@nxp.com>

package/multimedia/gstreamer/gstreamer.mk

@@ -23,7 +23,7 @@ GSTREAMER_CONF_OPT = \
 		$(DISABLE_LARGEFILE) \
 		--disable-examples \
 		--disable-tests \
-		--disable-failing-tests
+		--disable-failing-tests \
 		--disable-gtk-doc \
 		--without-html-dir