Use AM_MAINTAINER_MODE so configure supports --enable-maintainer-mode
A=mcgrathr
R=bradnelson at https://breakpad.appspot.com/864003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1251 4c0a9323-5329-0410-9bdc-e9ce6186880e
diff --git a/configure.ac b/configure.ac
index e2afc07..72b72d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,7 @@
 
 AM_INIT_AUTOMAKE(subdir-objects tar-ustar 1.11.1)
 AM_CONFIG_HEADER(src/config.h)
+AM_MAINTAINER_MODE
 
 AM_PROG_AS
 AC_PROG_CC