ws2_32::WSASendTo

pub unsafe extern "system" fn WSASendTo(s: SOCKET, lpBuffers: LPWSABUF, dwBufferCount: DWORD, lpNumberOfBytesSent: LPDWORD, dwFlags: DWORD, lpTo: *const SOCKADDR, iToLen: c_int, lpOverlapped: LPWSAOVERLAPPED, lpCompletionRoutine: LPWSAOVERLAPPED_COMPLETION_ROUTINE) -> c_int