Move libavutil define to avcommon.h

modules/codec/avcodec/avcodec.h

@@ -307,10 +307,6 @@ int ffmpeg_OpenCodec( decoder_t *p_dec );
 #   define AV_CPU_FLAG_ALTIVEC     FF_MM_ALTIVEC
 #endif
 
-#if LIBAVUTIL_VERSION_MAJOR < 52 && !defined(AV_CPU_FLAG_MMXEXT)
-#   define AV_CPU_FLAG_MMXEXT       AV_CPU_FLAG_MMX2
-#endif
-
 #if LIBAVCODEC_VERSION_MAJOR < 54
 #   define AV_PICTURE_TYPE_B        FF_B_TYPE
 #   define AV_PICTURE_TYPE_I        FF_I_TYPE

modules/codec/avcodec/avcommon.h

 /*****************************************************************************
- * avinit.h: common code for libav* initialization
+ * avcommon.h: common code for libav*
  *****************************************************************************
  * Copyright (C) 2012 the VideoLAN team
  * $Id$
@@ -68,6 +68,10 @@ static inline void vlc_init_avcodec(void)
 # include <libavutil/avutil.h>
 # include <libavutil/dict.h>
 
+#if LIBAVUTIL_VERSION_MAJOR < 52 && !defined(AV_CPU_FLAG_MMXEXT)
+#   define AV_CPU_FLAG_MMXEXT       AV_CPU_FLAG_MMX2
+#endif
+
 #define AV_OPTIONS_TEXT     "Advanced options."
 #define AV_OPTIONS_LONGTEXT "Advanced options, in the form {opt=val,opt2=val2} ."