Compare: https://github.com/dlang/dmd/blob/fa4ce7b89a7911f1097d32fab691ff8dfef40588/druntime/src/core/sys/windows/winsock2.d with: https://github.com/buggins/dwindow/blob/fbdaa1aef6a94471afd403ec8cfe4a4626cebeae/3rdparty/win32/winsock2.d In particular constants like `FD_CONNECT` are missing in the druntime bindings.
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