WeakRef, compile fixes for MSW

[ATS]

 A> I posted a small patch for this on SF tracker around a week ago (followup 
> A> tracker ID 1870445). It's a minor thing, and I'd feel better knowing 
> A> resolved. 
> 
>  Sorry, I didn't notice it somehow when applying the patches Sunday. I've
> just looked at it now and it seems ok but I prefer to have another look
> (and apply it) when I have slightly more time.
> 
Sounds good.

Thank you.
// ATS


>>  Thanks,
> VZ
>