iphlpapi: fix a compiler warning on non-Linux (try 2)

[Francois Gouget]

On Tue, 3 Mar 2009, Austin English wrote:

> AJ's recent work in this area caused a warning on non-Linux OS's,
> where this function is not used.
> 
> Resending with a proper extension.

Why does your patch modify dlls/ntdll/virtual.c? It seems to me that 
this should be separate.

-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
     Linux, WinNT, MS-DOS - also known as the Good, the Bad and the Ugly.