remove #if obsoleted after last major version bump

Originally committed as revision 7429 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -336,10 +336,8 @@ static const AVOption options[]={
 
 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options };
 
-#if LIBAVFORMAT_VERSION_INT >= ((51<<16)+(0<<8)+0)
-static
-#endif
-void avformat_get_context_defaults(AVFormatContext *s){
+static void avformat_get_context_defaults(AVFormatContext *s)
+{
     memset(s, 0, sizeof(AVFormatContext));
 
     s->av_class = &av_format_context_class;