lavc: remove disabled FF_API_AVFRAME_AGE cruft.

libavcodec/avcodec.h

@@ -923,13 +923,6 @@ typedef struct AVFrame {
      */
     int quality;
 
-#if FF_API_AVFRAME_AGE
-    /**
-     * @deprecated unused
-     */
-    attribute_deprecated int age;
-#endif
-
     /**
      * is this picture used as reference
      * The values for this are the same as the MpegEncContext.picture_structure

libavcodec/version.h

@@ -44,9 +44,6 @@
 #ifndef FF_API_OLD_DECODE_AUDIO
 #define FF_API_OLD_DECODE_AUDIO (LIBAVCODEC_VERSION_MAJOR < 55)
 #endif
-#ifndef FF_API_AVFRAME_AGE
-#define FF_API_AVFRAME_AGE (LIBAVCODEC_VERSION_MAJOR < 54)
-#endif
 #ifndef FF_API_OLD_ENCODE_AUDIO
 #define FF_API_OLD_ENCODE_AUDIO (LIBAVCODEC_VERSION_MAJOR < 55)
 #endif