Take over sole maintainership for all FLAC-related stuff

Originally committed as revision 18095 to svn://svn.ffmpeg.org/ffmpeg/trunk

MAINTAINERS

@@ -123,8 +123,7 @@ Codecs:
   dv.c                                  Roman Shaposhnik
   eacmv*, eaidct*, eat*                 Peter Ross
   ffv1.c                                Michael Niedermayer
-  flacdec.c                             Alex Beregszaszi, Justin Ruggles
-  flacenc.c, flacdata.[ch], flac.c      Justin Ruggles
+  flac*                                 Justin Ruggles
   flashsv*                              Benjamin Larsson
   flicvideo.c                           Mike Melanson
   g726.c                                Roman Shaposhnik