More base-derived fixes

src/core/file_sys/archive_savedata.h

@@ -34,6 +34,7 @@ private:
     ArchiveFactory_SaveData() = default;
     template <class Archive>
     void serialize(Archive& ar, const unsigned int) {
+        ar& boost::serialization::base_object<ArchiveFactory>(*this);
         ar& sd_savedata_source;
     }
     friend class boost::serialization::access;