[libcroco] configure: specify config macro dir

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 274678c35f0859f0a0f93356478f87dc42dd2be5
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Sat Oct 31 11:40:28 2015 +0100

    configure: specify config macro dir

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f082b13..9859fdf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,7 @@ AC_CANONICAL_HOST
 # gnu strictness to generate the INSTALL file
 AM_INIT_AUTOMAKE([1.13 tar-ustar dist-xz no-dist-gzip -Wno-portability gnu])
 AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
 
 if test -z "$enable_maintainer_mode"; then
   enable_maintainer_mode=yes