configure: Stop using AM_MAINTAINER_MODE

AM_MAINTAINER_MODE can be used to disable generation of rebuild rules.
This is not something we want to condone/support, considering it can
cause greater problems than the perceived benefits. Additionally the
Automake manual leans towards avoiding the use of AM_MAINTAINER_MODE.

http://www.gnu.org/software/automake/manual/html_node/maintainer_002dmode.html

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

autogen.sh

@@ -3,4 +3,4 @@
 test -n "$srcdir" || srcdir=`dirname "$0"`
 test -n "$srcdir" || srcdir=.
 autoreconf --force --install --verbose "$srcdir"
-test -n "$NOCONFIGURE" || "$srcdir/configure" --enable-maintainer-mode "$@"
+test -n "$NOCONFIGURE" || "$srcdir/configure" "$@"

configure.ac

@@ -30,7 +30,6 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 
 AM_INIT_AUTOMAKE([1.10 foreign dist-bzip2])
-AM_MAINTAINER_MODE([enable])
 
 # Enable quiet compiles on automake 1.11.
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])