Add hb_shape_list_shapers()
diff --git a/src/hb-shape.h b/src/hb-shape.h
index 75818dc..18b35ae 100644
--- a/src/hb-shape.h
+++ b/src/hb-shape.h
@@ -56,6 +56,9 @@
 	       const char          *shaper_options,
 	       const char         **shaper_list);
 
+const char **
+hb_shape_list_shapers (void);
+
 
 HB_END_DECLS