message: revert win32 change
diff: @@ -77,8 +77,7 @@ static std::string strerror()
  {
  std::string buff(80, '\0');
  #ifdef _WIN32
  - int err = strerror_s(&buff[0], buff.size(), errno);
  - if (err != 0) { sprintf_s(&buff[0], "unknown error: %d", err); }
  + buff = "unknown error";
  #else
  char* p = check_strerror_r(strerror_r(errno, &buff[0], buff.size()), &buff[0],
  buff.size());
  