Remove code that was disabled by the recent major version bump.

Originally committed as revision 17990 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/pixfmt.h

@@ -128,10 +128,4 @@ enum PixelFormat {
 #define PIX_FMT_RGB48 PIX_FMT_RGB48LE
 #endif
 
-#if LIBAVUTIL_VERSION_INT < (50<<16)
-#define PIX_FMT_UYVY411 PIX_FMT_UYYVYY411
-#define PIX_FMT_RGBA32  PIX_FMT_RGB32
-#define PIX_FMT_YUV422  PIX_FMT_YUYV422
-#endif
-
 #endif /* AVUTIL_PIXFMT_H */