WIDL: use __RPC_FAR attribute for pointers in proxies

[Mike McCormack]

Alexandre Julliard wrote:

>>* use __RPC_FAR attribute for pointers in proxies
> 
> 
> Is this really useful?  __RPC_FAR will always be an empty define, even
> when building on Windows, and I doubt we'll want to add 16-bit support
> to widl...

Yes, because it makes it easier to compare the output of midl and widl. 
  Additionally, I hope that projects other than Wine can use widl too 
one day...

Mike