This simple patch improve the situation as far as private inheritance is concerned.  In particular this allow usages like :
class X : Y, public TObject {};
This also corrects the temporary objects deletion in TClass::BuildRealData which was incorrect for classe inheriting from
TObject only as 2nd or later inheritances.


git-svn-id: http://root.cern.ch/svn/root/trunk@6256 27541ba8-7e3a-0410-8455-c3a389f83636