Fix root-cling ambiguity on class selection for DDG4

DDG4/include/DDG4/DDG4Dict.h

@@ -86,6 +86,7 @@ namespace { class DDG4Dict {};   }
 /// Dictionaires for basic Hit data structures
 #pragma link C++ class dd4hep::sim::Geant4HitData+;
 namespace dd4hep { namespace sim { typedef Geant4HitData* Geant4HitData_ptr_t; }}
+#pragma link C++ typedef Geant4HitData_ptr_t;
 #pragma link C++ class std::vector<dd4hep::sim::Geant4HitData_ptr_t>+;
 #pragma link C++ class dd4hep::sim::Geant4HitData::Contribution+;
 #pragma link C++ class dd4hep::sim::Geant4HitData::Contributions+;