lavc: remove disabled FF_API_DSP_MASK cruft

libavcodec/avcodec.h

@@ -2412,14 +2412,6 @@ typedef struct AVCodecContext {
 #define FF_IDCT_BINK          24
 #endif
 
-#if FF_API_DSP_MASK
-    /**
-     * Unused.
-     * @deprecated use av_set_cpu_flags_mask() instead.
-     */
-    attribute_deprecated unsigned dsp_mask;
-#endif
-
     /**
      * bits per sample/pixel from the demuxer (needed for huffyuv).
      * - encoding: Set by libavcodec.

libavcodec/version.h

@@ -49,9 +49,6 @@
 #ifndef FF_API_REQUEST_CHANNELS
 #define FF_API_REQUEST_CHANNELS (LIBAVCODEC_VERSION_MAJOR < 56)
 #endif
-#ifndef FF_API_DSP_MASK
-#define FF_API_DSP_MASK         (LIBAVCODEC_VERSION_MAJOR < 55)
-#endif
 #ifndef FF_API_FIND_BEST_PIX_FMT
 #define FF_API_FIND_BEST_PIX_FMT (LIBAVCODEC_VERSION_MAJOR < 55)
 #endif