windows: add cmsghdr and pktinfo structures

[database64128]

• CMSGHDR from ws2def.h, corresponds to Cmsghdr in unix
• IN_PKTINFO from ws2ipdef.h, corresponds to InetPktinfo in unix
• IN6_PKTINFO from ws2ipdef.h, corresponds to Inet6Pktinfo in unix

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This PR is being closed because golang.org/cl/658175 has been merged.