Ticket #4676: register_type.patch

.hpp

@@ -196 +196 @@
         ArchiveImplementation(is, flags)
     {}
     virtual ~polymorphic_iarchive_route(){};
+
+    using ArchiveImplementation::register_type;
 };
 
 } // namespace detail

.hpp

@@ -184 +184 @@
         ArchiveImplementation(os, flags)
     {}
     virtual ~polymorphic_oarchive_route(){};
+
+    using ArchiveImplementation::register_type;
 };
 
 } // namespace detail