avcodec/avcodec: Add missing deprecation to AVCodecParser.next

The whole old next API has been deprecated in commit
7e8eba2d, yet deprecating the next
pointer has been forgotten (the next pointers of other structures are
below the public API delimiter, but such a delimiter doesn't exist for
AVCodecParser).
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/avcodec.h

@@ -3512,7 +3512,10 @@ typedef struct AVCodecParser {
                         const uint8_t *buf, int buf_size);
     void (*parser_close)(AVCodecParserContext *s);
     int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
+#if FF_API_NEXT
+    attribute_deprecated
     struct AVCodecParser *next;
+#endif
 } AVCodecParser;
 
 /**

libavcodec/parsers.c

@@ -79,6 +79,7 @@ extern AVCodecParser ff_xma_parser;
 #include "libavcodec/parser_list.c"
 
 #if FF_API_NEXT
+FF_DISABLE_DEPRECATION_WARNINGS
 static AVOnce av_parser_next_init = AV_ONCE_INIT;
 
 static void av_parser_init_next(void)
@@ -106,6 +107,7 @@ void av_register_codec_parser(AVCodecParser *parser)
 {
     ff_thread_once(&av_parser_next_init, av_parser_init_next);
 }
+FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
 const AVCodecParser *av_parser_iterate(void **opaque)