message: Fix issue
  This PR makes it so that when creating a subprocess on windows no console window is displayed
diff: @@ -271,7 +271,7 @@ bool SubProcess::Start() {
  // Execute the child program.
  bool bSuccess =
  CreateProcessA(nullptr, const_cast<char*>(command_line.c_str()), nullptr,
  - nullptr, TRUE, 0, nullptr, nullptr, &si,
  + nullptr, TRUE, CREATE_NO_WINDOW, nullptr, nullptr, &si,
  reinterpret_cast<PROCESS_INFORMATION*>(win_pi_));
  if (bSuccess) {
  