ws2_32: Add support and tests for WSARecvMsg and IP_PKTINFO.

[Erich Hoover]

If you guys would mind looking over this revised patchset I would
greatly appreciate it, I believe I've appropriately included your
corrections.  Please note that mswsock.h and ws2ipdef.h will be
submitted as separate patches.  Thanks in advance!

Erich Hoover
ehoover at mines.edu
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