clone Class/Module rightly

Cloned Class/Module has no method table or super class.

```
mirb - Embeddable Interactive Ruby Shell

This is a very early version, please test and report errors.
Thanks :)

> String.clone.new
Segmentation fault: 11
```

```
mirb - Embeddable Interactive Ruby Shell

This is a very early version, please test and report errors.
Thanks :)

> module A
*   def foo
*   end
* end
 => :foo
> class B
*   include A.clone
* end
 => B
> B.new.foo
(mirb):1: undefined method 'foo' for #<B:0x7fe9138038a0> (NoMethodError)
```