"lua_open": now lua has an explicit open operation.

llex.h

@@ -1,5 +1,5 @@
 /*
-** $Id: $
+** $Id: llex.h,v 1.1 1997/09/16 19:25:59 roberto Exp roberto $
 ** Lexical Analizer
 ** See Copyright Notice in lua.h
 */
@@ -13,6 +13,8 @@
 
 extern int luaX_linenumber;
 
+
+void luaX_init (void);
 int  luaY_lex (void);
 void luaX_setinput (ZIO *z);
 char *luaX_lasttoken (void);