Merge commit 'fa2a34cd40d124161c748bb0f430dc63c94dd0da'

* commit 'fa2a34cd40d124161c748bb0f430dc63c94dd0da':
  lavfi: change the filter registering system to match the other libraries

Conflicts:
	cmdutils.c
	ffplay.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h

This removes the ability to put AVFilters in read only memory and having
them shareable.

Merged-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg.c

@@ -499,7 +499,6 @@ static void exit_program(void)
 
     uninit_opts();
 
-    avfilter_uninit();
     avformat_network_deinit();
 
     if (received_sigterm) {