removed lua_ddl.c

examples/lua_dll.c

-#include <stdio.h>
-#include "lua_5.2.1.h"
-
-static int smile(lua_State *L) {
-  (void) L;  // Unused
-  printf("%s\n", ":-)");
-  return 0;
-}
-
-int LUA_API luaopen_lua_dll(lua_State *L) {
-  static const struct luaL_Reg api[] = {
-    {"smile", smile},
-    {NULL, NULL},
-  };
-  luaL_openlib(L, "lua_dll", api, 0);
-  return 1;
-}