opus + jpegformat plugin builds fail when gstreamer is configured with
--disable-gst-debug as they are checking the GST_DISABLE_DEBUG symbol
instead of GST_DISABLE_GST_DEBUG.
Submitted upstream as https://bugzilla.gnome.org/show_bug.cgi?id=683850
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
