dnsquery.c failed to compile on win32

[Paul Aurich]

And 马旋（SuperMMX） spoke on 07/20/2009 02:34 AM, saying:
> 
> Hi, Guys:
> 
> libpurple/dnsquery.c failed to compile on win32, here is the patch.
> 

Fixed. Thanks!

I should probably set up a cross-compile env so I can compile test that
sort of thing. :/

~Paul