Don't close external sockets in finalize.

src/sbbs3/js_socket.c

@@ -403,6 +403,7 @@ static void js_finalize_socket(JSContext *cx, JSObject *obj)
 	if((p=(js_socket_private_t*)JS_GetPrivate(cx,obj))==NULL)
 		return;
 
+	if (!p->external)
 		do_js_close(p);
 
 	if(p->hostname)