Add Jason Garrett-Glaser as libx264 maintainer.

Originally committed as revision 15614 to svn://svn.ffmpeg.org/ffmpeg/trunk

MAINTAINERS

@@ -145,7 +145,7 @@ Codecs:
   kmvc.c                                Kostya Shishkov
   lcl*.c                                Roberto Togni
   libgsm.c                              Michel Bardiaux
-  libx264.c                             Mans Rullgard
+  libx264.c                             Mans Rullgard, Jason Garrett-Glaser
   loco.c                                Kostya Shishkov
   lzo.h, lzo.c                          Reimar Doeffinger
   mdec.c                                Michael Niedermayer