comment about exported function not used by Lua

ldo.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.h,v 2.7 2005/08/24 16:15:49 roberto Exp roberto $
+** $Id: ldo.h,v 2.8 2006/07/11 15:53:29 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -51,6 +51,7 @@ LUAI_FUNC void luaD_growstack (lua_State *L, int n);
 LUAI_FUNC void luaD_throw (lua_State *L, int errcode);
 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
 
+/* exported for Coco */
 LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
 
 #endif