dnsquery.c failed to compile on win32

[马旋（SuperMMX）]

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Hi, Guys:

libpurple/dnsquery.c failed to compile on win32, here is the patch.

- -- 
A. Because it makes the logic of the discussion difficult to follow.
Q. Why shoudn't I top post?
A. No.
Q Should I top post?

A: Because it destroys the flow of the conversation
Q: Why is it bad?
A: No, it's bad.
Q: Should I top post in replies to mailing lists? 
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