avfilter/lavfutils.h: Don't include avformat.h

Only lavfutils.c needs avformat.h, not lavfutils.h.
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavfilter/lavfutils.c

@@ -19,6 +19,7 @@
  */
 
 #include "libavutil/imgutils.h"
+#include "libavformat/avformat.h"
 #include "lavfutils.h"
 
 int ff_load_image(uint8_t *data[4], int linesize[4],

libavfilter/lavfutils.h

@@ -24,7 +24,8 @@
 #ifndef AVFILTER_LAVFUTILS_H
 #define AVFILTER_LAVFUTILS_H
 
-#include "libavformat/avformat.h"
+#include <stdint.h>
+#include "libavutil/pixfmt.h"
 
 /**
  * Load image from filename and put the resulting image in data.