gst-ffmpeg: disable for MIPS R6

This package bundles a version of libav which doesn't have support for
MIPS R6.

Fixes:

  http://autobuild.buildroot.org/results/e54/e54f0f9aa8fbc1760379ce64d17422810864b56b/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gstreamer/gst-ffmpeg/Config.in

@@ -1,5 +1,8 @@
 config BR2_PACKAGE_GST_FFMPEG
 	bool "gst-ffmpeg"
+	# Unsupported for MIPS R6. It bundles a version of libav which
+	# doesn't have support for MIPS R6.
+	depends on !BR2_mips_32r6 && !BR2_mips_64r6
 	select BR2_PACKAGE_GST_PLUGINS_BASE
 	help
 	  GStreamer plugin containing one plugin with a set of elements using