gl: Pass GL_CFLAGS to g-ir-scanner

This unbreaks building when some headers are under a non-standard path.
e.g. /usr/X11R6/include as on OpenBSD.

https://bugzilla.gnome.org/show_bug.cgi?id=755850

diff --git a/gst-libs/gst/gl/Makefile.am b/gst-libs/gst/gl/Makefile.am
index 36f3bf7..f968357 100644 (file)
--- a/gst-libs/gst/gl/Makefile.am
+++ b/gst-libs/gst/gl/Makefile.am
@@ -143,6 +143,7 @@ GstGL-@GST_API_VERSION@.gir: $(INTROSPECTION_SCANNER) libgstgl-@GST_API_VERSION@
                -I$(top_srcdir)/gst-libs \
                -I$(top_builddir)/gst-libs \
                $(GST_PLUGINS_BASE_CFLAGS) \
+               $(GL_CFLAGS) \
                --add-include-path=`PKG_CONFIG_PATH="$(GST_PKG_CONFIG_PATH)" $(PKG_CONFIG) --variable=girdir gstreamer-@GST_API_VERSION@` \
                --add-include-path=`PKG_CONFIG_PATH="$(GST_PKG_CONFIG_PATH)" $(PKG_CONFIG) --variable=girdir gstreamer-base-@GST_API_VERSION@` \
                --library=libgstgl-@GST_API_VERSION@.la \