[dconf-editor] Readd AC_CONFIG_MACRO_DIR.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 2198fbc9ed89d92b78c41a6c36a7f4cd9a030301
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Jan 1 07:58:29 2017 +0100

    Readd AC_CONFIG_MACRO_DIR.

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 479301f..02b92e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,6 +5,7 @@ AC_INIT([dconf-editor],[3.22.0],[https://bugzilla.gnome.org/enter_bug.cgi?produc
 AC_CONFIG_SRCDIR([configure.ac])
 
 AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
 
 AM_INIT_AUTOMAKE([1.11.2 foreign -Wno-portability no-dist-gzip dist-xz])
 AM_SILENT_RULES([yes])