package/tvheadend: transcoding depends on ffmpeg

Commit
https://git.buildroot.net/buildroot/commit/package/tvheadend?id=a9a14dc4357d32f705a52a5da73c782576ce6bc8
forgot to add the reverse dependency from ffmpeg.

Fixes
http://autobuild.buildroot.net/results/91a/91a08e63690421a0c197e987af15e91e78afb96f/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/tvheadend/Config.in

@@ -29,6 +29,7 @@ if BR2_PACKAGE_TVHEADEND
 
 config BR2_PACKAGE_TVHEADEND_TRANSCODING
 	bool "transcoding support"
+	depends on BR2_PACKAGE_FFMPEG_ARCH_SUPPORTS
 	select BR2_PACKAGE_FFMPEG
 	select BR2_PACKAGE_FFMPEG_AVRESAMPLE
 	select BR2_PACKAGE_FFMPEG_GPL # needed for x264 support