[PATCH] w32: Fix clang compiler error with function pointer

[Biswapriyo Nath]

> Oh, right.  Your patch actually has two changes.  You should also be
> able to also cast the pointer to "(BOOL (*)(DWORD))" without naming the
> type.  E.g.
>
> func = (BOOL (*)(DWORD)) GetProcAddress (handle, "AllowSetForegroundWindow");

Yeah, that would also work. I just add the type to make it little bit
more readable.