AVOptions: deprecate unused AV_OPT_FLAG_METADATA

It was never used since it was added and the things it was intended for
are now exported differently.

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2013-12-xx
 
 API changes, most recent first:
 
+2014-xx-xx - xxxxxxx - lavu 53.03.01 - opt.h
+  Deprecate unused AV_OPT_FLAG_METADATA.
+
 2014-02-xx - xxxxxxx - lavu 53.3.0 - frame.h
   Add AV_FRAME_DATA_DOWNMIX_INFO value to the AVFrameSideDataType enum and
   downmix_info.h API, which identify downmix-related metadata.

libavutil/opt.h

@@ -262,7 +262,9 @@ typedef struct AVOption {
     int flags;
 #define AV_OPT_FLAG_ENCODING_PARAM  1   ///< a generic parameter which can be set by the user for muxing or encoding
 #define AV_OPT_FLAG_DECODING_PARAM  2   ///< a generic parameter which can be set by the user for demuxing or decoding
+#if FF_API_OPT_TYPE_METADATA
 #define AV_OPT_FLAG_METADATA        4   ///< some data extracted or inserted into the file like title, comment, ...
+#endif
 #define AV_OPT_FLAG_AUDIO_PARAM     8
 #define AV_OPT_FLAG_VIDEO_PARAM     16
 #define AV_OPT_FLAG_SUBTITLE_PARAM  32

libavutil/version.h

@@ -55,7 +55,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR 53
 #define LIBAVUTIL_VERSION_MINOR  3
-#define LIBAVUTIL_VERSION_MICRO  0
+#define LIBAVUTIL_VERSION_MICRO  1
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \
@@ -108,6 +108,9 @@
 #ifndef FF_API_XVMC
 #define FF_API_XVMC                     (LIBAVUTIL_VERSION_MAJOR < 54)
 #endif
+#ifndef FF_API_OPT_TYPE_METADATA
+#define FF_API_OPT_TYPE_METADATA        (LIBAVUTIL_VERSION_MAJOR < 54)
+#endif
 
 /**
  * @}