lavf: remove disabled FF_API_GUESS_IMG2_CODEC cruft

libavformat/avformat.h

@@ -1191,10 +1191,6 @@ AVProgram *av_new_program(AVFormatContext *s, int id);
  */
 
 
-#if FF_API_GUESS_IMG2_CODEC
-attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
-#endif
-
 /**
  * @addtogroup lavf_decoding
  * @{

libavformat/img2.c

@@ -199,12 +199,6 @@ enum CodecID ff_guess_image2_codec(const char *filename)
     return av_str2id(img_tags, filename);
 }
 
-#if FF_API_GUESS_IMG2_CODEC
-enum CodecID av_guess_image2_codec(const char *filename){
-    return av_str2id(img_tags, filename);
-}
-#endif
-
 static int read_header(AVFormatContext *s1)
 {
     VideoData *s = s1->priv_data;

libavformat/version.h

@@ -47,9 +47,6 @@
  * Those FF_API_* defines are not part of public API.
  * They may change, break or disappear at any time.
  */
-#ifndef FF_API_GUESS_IMG2_CODEC
-#define FF_API_GUESS_IMG2_CODEC        (LIBAVFORMAT_VERSION_MAJOR < 54)
-#endif
 #ifndef FF_API_SDP_CREATE
 #define FF_API_SDP_CREATE              (LIBAVFORMAT_VERSION_MAJOR < 54)
 #endif