Use upstream gettext instead the glib one

autogen.sh

@@ -7,6 +7,10 @@ test -n "$srcdir" || srcdir=.
 olddir=`pwd`
 cd "$srcdir"
 
+# GNU gettext automake support doesn't get along with git.
+# https://bugzilla.gnome.org/show_bug.cgi?id=661128
+touch -t 200001010000 po/glib.pot
+
 GTKDOCIZE=$(which gtkdocize 2>/dev/null)
 if test -z $GTKDOCIZE; then
         echo "You don't have gtk-doc installed, and thus won't be able to generate the documentation."