Add an entry for the avfilter_make_format_list() interface change.

Originally committed as revision 20303 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/APIchanges

@@ -12,6 +12,11 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2009-10-19 - r20302 - lavfi 1.3.0 - avfilter_make_format_list()
+  Change the interface of avfilter_make_format_list() from
+  avfilter_make_format_list(int n, ...) to
+  avfilter_make_format_list(enum PixelFormat *pix_fmts).
+
 2009-10-18 - r20272 - lavfi 1.0.0 - avfilter_get_video_buffer()
   Make avfilter_get_video_buffer() recursive and add the w and h
   parameters to it.