[gcr] Fix the build with automake 1.13

[Stefan Walter <stefw src gnome org>]

commit 281dbe5d6be19509f7aa457616c72b038f51ec5c
Author: Nuno Araujo <nuno araujo russo79 com>
Date:   Tue Jan 15 16:21:15 2013 +0100

    Fix the build with automake 1.13
    
    In Automake 1.13, the long-deprecated macro AM_CONFIG_HEADER (deprecated
    since 2002) has been removed in favour of AC_CONFIG_HEADERS.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692095

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2c93587..92090bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,7 @@ dnl ****************************************************************************
 AC_CONFIG_MACRO_DIR([build/m4])
 AM_INIT_AUTOMAKE([1.11 tar-ustar foreign -Wno-portability])
 AM_SANITY_CHECK
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AM_MAINTAINER_MODE([enable])