copyright fix

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7467 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/aes.c

 /*
- * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
+ * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at> and Reimar Dffinger
  *
  * This file is part of FFmpeg.
  *