configure.ac: remove AM_MAINTAINER_MODE

Using this macro can lead to various security issues, as pointed out in
the automake manual. Follow the example set by most X components and
remove it from the build.
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>

autogen.sh

@@ -9,4 +9,4 @@ cd $srcdir
 autoreconf -v --install || exit 1
 cd $ORIGDIR || exit $?
 
-$srcdir/configure --enable-maintainer-mode "$@"
+$srcdir/configure "$@"

configure.ac

@@ -2,7 +2,6 @@ AC_PREREQ(2.60)
 
 AC_INIT(libvdpau, 1.1, [vdpau@lists.freedesktop.org], libvdpau)
 AM_INIT_AUTOMAKE([dist-bzip2 foreign])
-AM_MAINTAINER_MODE
 
 AC_CONFIG_HEADERS(config.h)