Merge commit '565e4993c63f797e2d50ad2f1e8f62fdbe299666'

The commit has already been split and commited, this merge is just for metadata.
What has not been merged is the removial of some start/end_frame / draw_slice
related functions that are still in use. They can be removed once they are
unused.

* commit '565e4993c63f797e2d50ad2f1e8f62fdbe299666':
  lavfi: merge start_frame/draw_slice/end_frame

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

libavfilter/af_ashowinfo.c

@@ -35,6 +35,7 @@
 
 #include "audio.h"
 #include "avfilter.h"
+#include "internal.h"
 
 typedef struct AShowInfoContext {
     /**

libavfilter/avfilter.c

@@ -23,9 +23,12 @@
 #include "libavutil/avstring.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/common.h"
+#include "libavutil/imgutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/rational.h"
+#include "libavutil/samplefmt.h"
 
+#include "audio.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"