$OpenBSD: patch-objects_tag_h,v 1.1 2021/02/02 15:37:25 bket Exp $

Fix -fno-common build failure. Taken from
https://github.com/awesomeWM/awesome/commit/d256d9055095f27a33696e0aeda4ee20ed4fb1a0

Index: objects/tag.h
--- objects/tag.h.orig
+++ objects/tag.h
@@ -46,7 +46,7 @@ struct tag
     client_array_t clients;
 };
 
-lua_class_t tag_class;
+extern lua_class_t tag_class;
 LUA_OBJECT_FUNCS(tag_class, tag_t, tag)
 
 void tag_class_setup(lua_State *);
