use empty underlay dirs when building po underlays

Makefile.PL

@@ -62,6 +62,7 @@ underlaypo: ikiwiki.out
 			install -m 644 $$file po/underlays/directives/ikiwiki/directive; \
 		fi \
 	done
+	install -d po/underlays/empty
 	$(PERL) -Iblib/lib $(extramodules) $(tflag) ikiwiki.out -libdir . -setup underlaypo.setup -refresh
 	find po/underlays -name \*.mdwn | xargs rm -f
 

underlaypo.setup

@@ -8,8 +8,8 @@ use IkiWiki::Setup::Standard {
 	# will excessively bloat things.
         po_slave_languages => {
 		#'fr' => 'Français',
-                #'es' => 'Español',
-                #'de' => 'Deutsch',
+		#'es' => 'Español',
+		#'de' => 'Deutsch',
         },
 	po_master_language => { 'code' => 'en', 'name' => 'English' },
 	po_translatable_pages => "*",
@@ -20,8 +20,8 @@ use IkiWiki::Setup::Standard {
 	destdir => "po/html",
 	templatedir => "templates",
 	# we don't want to pull in the normal underlays
-	underlaydirbase => "po/underlays",
-	underlaydir => "po/underlays/basewiki",
+	underlaydirbase => "po/underlays/empty",
+	underlaydir => "po/underlays/empty",
 	discussion => 0,
 	locale => '',
 	verbose => 1,