add myself as maintainer for new FLAC files

Originally committed as revision 18093 to svn://svn.ffmpeg.org/ffmpeg/trunk

MAINTAINERS

@@ -124,7 +124,7 @@ Codecs:
   eacmv*, eaidct*, eat*                 Peter Ross
   ffv1.c                                Michael Niedermayer
   flacdec.c                             Alex Beregszaszi, Justin Ruggles
-  flacenc.c                             Justin Ruggles
+  flacenc.c, flacdata.[ch], flac.c      Justin Ruggles
   flashsv*                              Benjamin Larsson
   flicvideo.c                           Mike Melanson
   g726.c                                Roman Shaposhnik