iphlpapi: Changed return value of NotifyAddrChange() stub and added test cases.

[André Hentschel]

Hi,
in todo_wine blocks only ok() calls should be made.
So consider splitting them down to "todo_wine ok(..." for each.

> -CancelIPChangeNotify
>  CreateProxyArpEntry
>  DeleteIPAddress
>  DeleteProxyArpEntry
>  EnableRouter
>  FlushIpNetTable
>  GetAdapterIndex
> -NotifyAddrChange
> -NotifyRouteChange
> +NotifyRouteChange + CancelIPChangeNotify

this change regarding CancelIPChangeNotify is also not needed.

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Best Regards, André Hentschel