DNSAPI: add a couple of macros and prototypes (resend)

[Hans Leidekker]

This header presents a problem for Wine's AW handling because it
references types in undecorated form. For example:

 BOOL WINAPI DnsRecordCompare(PDNS_RECORD,PDNS_RECORD);

DNS_RECORD is in fact a polymorphic type, it embeds a flag that
specifies the character set for the structure. This patch solves
the problem by conditionally and arbitrarily defining DNS_RECORD
as DNS_RECORDW.

Is this an acceptable solution?

 -Hans

Changelog
  Add a couple of macros and prototypes.
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