disable yuv_image_format

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3803 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/allformats.c

@@ -119,9 +119,7 @@ void av_register_all(void)
     av_register_image_format(&ppm_image_format);
     av_register_image_format(&pam_image_format);
     av_register_image_format(&pgmyuv_image_format);
-#endif
     av_register_image_format(&yuv_image_format);
-#if 0
 #ifdef CONFIG_ZLIB
     av_register_image_format(&png_image_format);
 #endif