gst: make sure gobject-introspection scanner calls gst_init()

https://bugzilla.gnome.org/show_bug.cgi?id=647922

gst/Makefile.am

@@ -290,6 +290,7 @@ Gst-@GST_MAJORMINOR@.gir: $(INTROSPECTION_SCANNER) libgstreamer-@GST_MAJORMINOR@
 		--pkg gthread-2.0 \
 		--pkg libxml-2.0 \
 		--pkg-export gstreamer-0.10 \
+		--add-init-section="gst_init(NULL, NULL);" \
 		--output $@ \
 		$(gir_headers) \
 		$(gir_sources)