ws2_32: Add support and tests for WSARecvMsg and IP_PKTINFO.

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    While searching for something else I discovered a bug relevant to the
interface-bound UDP broadcast patches I've been working on.  Apparently,
IP_PKTINFO does work on Windows when used with the special WSARecvMsg
function (Bug #19493).  The attached patch addresses this issue by
implementing WSARecvMsg through WS2_recvfrom and by converting the Unix
IP_PKTINFO response to the Windows equivalent.
ChangeLog:
    ws2_32: Add support and tests for WSARecvMsg and IP_PKTINFO.
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