message: tcp::server::ConnectionProvider: Fix dual-stack sockets on Windows
diff: @@ -184,6 +184,16 @@ oatpp::v_io_handle ConnectionProvider::instantiateServer(){
  if (serverHandle != INVALID_SOCKET) {
  + int no = 0;
  +
  + if (hints.ai_family == AF_UNSPEC || hints.ai_family == Address::IP_6) {
  + if (setsockopt(serverHandle, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&no, sizeof( int ) ) != 0 ) {
  + OATPP_LOGW("[oatpp::network::tcp::server::ConnectionProvider::instantiateServer()]",
  + "Warning. Failed to set %s for accepting socket: %s", "IPV6_V6ONLY",
  + strerror(errno));
  + }
  + }
  +
  if (bind(serverHandle, currResult->ai_addr, (int) currResult->ai_addrlen) != SOCKET_ERROR &&
  listen(serverHandle, SOMAXCONN) != SOCKET_ERROR)
  {
  