Add myself to "write after approval" list.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@30895 138bc75d-0d04-0410-961f-82ee72b054a4

MAINTAINERS

@@ -90,6 +90,7 @@ Jan Hubicka					hubicka@freesoft.cz
 Klaus Kaempf					kkaempf@progis.de
 Geoff Keating					geoffk@cygnus.com
 Brendan Kehoe					brendan@cygnus.com
+Mumit Khan					khan@xraylith.wisc.edu
 Benjamin Kosnik					bkoz@cygnus.com
 Marc Lehmann					pcg@goof.com
 Don Lindsay					dlindsay@cygnus.com