Remove JACK input device addition entry.

The addition of a new component is not considered an API change.

Originally committed as revision 18329 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/APIchanges

@@ -12,9 +12,6 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
-2009-04-03 - r18322 - lavd 52.2.0 - JACK input device
-  Add a JACK input device.
-
 2009-04-03 - r18321 - lavu 50.3.0 - av_fifo_space
   Introduce the av_fifo_space() function.