marking AVPaletteControl as deprecated due to thread saftey amongth other...

marking AVPaletteControl as deprecated due to thread saftey amongth other issues (it doesnt work if theres any delay between demuxer and decoder)

Originally committed as revision 6397 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -2086,6 +2086,7 @@ typedef struct AVPicture {
  * AVPaletteControl
  * This structure defines a method for communicating palette changes
  * between and demuxer and a decoder.
+ * this is totally broken, palette changes should be sent as AVPackets
  */
 #define AVPALETTE_SIZE 1024
 #define AVPALETTE_COUNT 256
@@ -2101,7 +2102,7 @@ typedef struct AVPaletteControl {
      * data is probably 6 bits in size and needs to be scaled */
     unsigned int palette[AVPALETTE_COUNT];
 
-} AVPaletteControl;
+} AVPaletteControl attribute_deprecated;
 
 typedef struct AVSubtitleRect {
     uint16_t x;