lavfi/lavfutils: include required headers explicitly

libavfilter/lavfutils.c

@@ -18,8 +18,17 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stdint.h>
+
+#include "libavutil/dict.h"
 #include "libavutil/imgutils.h"
+#include "libavutil/log.h"
+#include "libavutil/pixfmt.h"
+
 #include "libavformat/avformat.h"
+
+#include "libavcodec/avcodec.h"
+
 #include "lavfutils.h"
 
 int ff_load_image(uint8_t *data[4], int linesize[4],