Replace deprecated FF_*_TYPE symbols with AV_PICTURE_TYPE_*.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavcodec/avcodec.h

@@ -3842,7 +3842,7 @@ typedef struct AVCodecParserContext {
     /*!
      * Set by parser to 1 for key frames and 0 for non-key frames.
      * It is initialized to -1, so if the parser doesn't set this flag,
-     * old-style fallback using FF_I_TYPE picture type as key frames
+     * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
      * will be used.
      */
     int key_frame;