[mutter/wayland] build: Create m4 directory

[Jasper St. Pierre <jstpierre src gnome org>]

commit 814b2dbda91ecf33315bacf3e8f0f1e4f679a947
Author: Seán de Búrca <leftmostcat gmail com>
Date:   Mon Aug 26 06:47:13 2013 -0400

    build: Create m4 directory
    
    Due to changes in gnome-common git, an implicit m4 directory is no
    longer created during autogen. The attached patch explicitly and
    correctly specifies a macro directory.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=706787

 Makefile.am  |    2 ++
 configure.ac |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 0529c40..b55c1d1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,8 @@
 
 SUBDIRS=src po doc
 
+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+
 DISTCLEANFILES = intltool-extract intltool-merge intltool-update po/stamp-it po/.intltool-merge-cache
 
 DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc
diff --git a/configure.ac b/configure.ac
index 180af40..3f91c7e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,7 @@ m4_define([mutter_plugin_api_version], [3])
 AC_INIT([mutter], [mutter_version],
         [http://bugzilla.gnome.org/enter_bug.cgi?product=mutter])
 
+AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR(src/core/display.c)
 AC_CONFIG_HEADERS(config.h)