[krbdev.mit.edu #8688] URI lookups don't work on Windows

[Greg Hudson via RT]

DNS_QUERY_RETURN_MESSAGE does not seem to do anything (the docs say it 
isn't supported in W2K, but they might actually mean it isn't supported 
in W2K or later).  After discussion with dochelp, it doesn't appear 
that there's any future-proof way to use DnsQuery() with new record 
types.  So this bug seems unfixable for now, short of including or 
depending on a complete DNS implementation.