ConvertToSubClassCode for IDispatch

[Weitian Leung]

Hello,
     I have a IDispatch related sdk header, say it contains two IDispatch interfaces:
```
interface _Foo : public IDispatch {…};
typedef interface Foo Foo; // No definition at all
```

`Foo` can be QueryInterface from `_Foo` in C++ (or just do a cast), and for this case I asume they are just the same class.

As the sdk internal only uses the Foo interface, such as:
```
interface Bar : public IDispatch
{
      bool open(…, Foo** out);
      void dosomething(Foo* f);
};
```

So I use ConvertToSubClassCode to resolve the buggy sdk:
```
    class Foo /Abstract,NoDefaultCtors/
    {
    %ConvertToSubClassCode
        sipType = sipType__Foo;
    %End
    };
```

It works for `open`, but not for `dosomething` due to ConvertToSubClassCode make `open` returns a `_Foo`, they have no inherits from python’s view.

I can’ｔ change the C++ sdk as it out of my control．
So is there any chance to make SIP works for such case?

Thanks.
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