Updates for Automake 1.13.

autoreconf will install config/test-driver, ignore it.
Update gettext m4 and po files to version 0.18.2.
Use AM_CPPFLAGS instead of INCLUDES.
All changes are backward compatible with Automake 1.11.
diff --git a/po/ChangeLog b/po/ChangeLog
index a90f4ad..326bd67 100644
--- a/po/ChangeLog
+++ b/po/ChangeLog
@@ -1,3 +1,7 @@
+2013-04-24  Mark Wielaard  <mjw@redhat.com>
+
+	* Makefile.in.in: Upgrade to gettext-0.18.2.
+
 2012-08-27  Mark Wielaard  <mjw@redhat.com>
 
 	* *.po: Update for 0.155.