add myself as build system maintainer

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@5495 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

MAINTAINERS

@@ -45,7 +45,7 @@ Miscellaneous Areas
 
 documentation                           Mike Melanson, Diego Biurrun
 website                                 Mike Melanson, Diego Biurrun
-build system (configure,Makefiles)      Diego Biurrun
+build system (configure,Makefiles)      Diego Biurrun, Mans Rullgard
 project server                          Diego Biurrun, Mans Rullgard