Disable the maintainer mode by default.

We have to have this as long as we distribute the automatically generated
Autotools and othe files via the git repository.

configure.ac

@@ -18,7 +18,7 @@ AC_CANONICAL_HOST
 AC_CANONICAL_BUILD
 
 AM_INIT_AUTOMAKE([foreign])
-AM_MAINTAINER_MODE([enable])
+AM_MAINTAINER_MODE([disable])
 AM_EXTRA_RECURSIVE_TARGETS([examples])
 
 m4_pushdef([_AC_PROG_CC_C89],