[Windows] Pass WSA_FLAG_OVERLAPPED when making sockets
[Windows] Pass WSA_FLAG_OVERLAPPED when making sockets

Not specifying this causes closesocket() and shutdown() to hang.

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation