message: Fix a new linux build problem introduced by my other changes.
diff: @@ -591,7 +591,8 @@ map<int, int> EU4::world::determineValidProvinces()
  void EU4::world::loadCountries(istream& theStream)
  {
  countries processedCountries(theStream);
  - theCountries.swap(processedCountries.getTheCountries());
  + auto theProcessedCountries = processedCountries.getTheCountries();
  + theCountries.swap(theProcessedCountries);
  }
  