Add cook decoder

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@4728 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

doc/ffmpeg-doc.texi

@@ -853,6 +853,8 @@ other implementations.
 @tab experimental lossy/lossless codec
 @item Qdesign QDM2           @tab      @tab X
 @tab there are still some distortions
+@item Real COOK              @tab      @tab X
+@tab All versions except 5.1 are supported
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.