build-sys: add NLS support

Add GNU gettext internationalization and localization support.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

autogen.sh

@@ -54,6 +54,13 @@ echo "   libtoolize: $(libtoolize --version | head -1)"
 rm -rf autom4te.cache
 
 set -e
+po/update-potfiles
+autopoint --force $AP_OPTS
+if ! grep -q datarootdir po/Makefile.in.in; then
+	echo autopoint does not honor dataroot variable, patching.
+	sed -i -e 's/^datadir *=\(.*\)/datarootdir = @datarootdir@\
+datadir = @datadir@/g' po/Makefile.in.in
+fi
 libtoolize --force ${LT_OPTS}
 aclocal -I m4 ${AL_OPTS}
 autoconf ${AC_OPTS}