lavc: remove disabled FF_API_SNOW_GLOBAL_OPTS cruft.

libavcodec/avcodec.h

@@ -596,9 +596,6 @@ typedef struct RcOverride{
 #if FF_API_MJPEG_GLOBAL_OPTS
 #define CODEC_FLAG_EXTERN_HUFF     0x1000   ///< Use external Huffman table (for MJPEG).
 #endif
-#if FF_API_SNOW_GLOBAL_OPTS
-#define CODEC_FLAG2_MEMC_ONLY     0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
-#endif
 /**
  * @}
  */

libavcodec/version.h

@@ -41,9 +41,6 @@
 #ifndef FF_API_REQUEST_CHANNELS
 #define FF_API_REQUEST_CHANNELS (LIBAVCODEC_VERSION_MAJOR < 55)
 #endif
-#ifndef FF_API_SNOW_GLOBAL_OPTS
-#define FF_API_SNOW_GLOBAL_OPTS  (LIBAVCODEC_VERSION_MAJOR < 54)
-#endif
 #ifndef FF_API_MJPEG_GLOBAL_OPTS
 #define FF_API_MJPEG_GLOBAL_OPTS (LIBAVCODEC_VERSION_MAJOR < 54)
 #endif