[dconf] Bump automake dependency to 1.13

[Ryan Lortie <desrt src gnome org>]

commit 132ea816d7b76adaa8ae764077bff6387d979e72
Author: Ryan Lortie <desrt desrt ca>
Date:   Thu Mar 13 13:31:19 2014 -0400

    Bump automake dependency to 1.13
    
    Since we dropped ACLOCAL_AMFLAGS in Makefile.am we should depend on automake
    1.13 (since this is the version that supports using AC_CONFIG_MACRO_DIRS
    directly).

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3d02835..a9892cd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([aux])
 AC_CONFIG_HEADERS([config.h])
 
-AM_INIT_AUTOMAKE([1.11.2 foreign -Wno-portability no-dist-gzip dist-xz])
+AM_INIT_AUTOMAKE([1.13 foreign -Wno-portability no-dist-gzip dist-xz])
 AM_SILENT_RULES([yes])
 
 # Set default CFLAGS before AC_PROG_CC does