winsock: use iphlpapi (take 2)

[Juan Lang]

Removed C++-style comments.  Supercedes:
http://www.winehq.org/hypermail/wine-patches/2003/05/0071.html

ChangeLog: uses iphlpapi to implement
SIO_GET_INTERFACE_LIST in WSAIoctl, and corrects
iiFlags entry in the returned interface list.

--Juan

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