Replace ostringstream by direct use of ostream.
Replace ostringstream by direct use of ostream.

bhargavpanth/Overpass-API,elbakai/Overpass-API,bhargavpanth/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API,elbakai/Overpass-API,mmd-osm/Overpass-API,elbakai/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API,bhargavpanth/Overpass-API,mmd-osm/Overpass-API,bhargavpanth/Overpass-API,elbakai/Overpass-API,elbakai/Overpass-API,bhargavpanth/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,elbakai/Overpass-API,bhargavpanth/Overpass-API