NIO: make BSDSocketAPI build on Windows (#1657)
NIO: make BSDSocketAPI build on Windows (#1657)

These interfaces use types from WinSDK to re-export them in the NIO
namespace.  Import the types required.  This allows us to build this
file on Windows again.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio