Remove mention of Cint (even indirect :))


git-svn-id: https://root.cern.ch/svn/root/trunk@48487 27541ba8-7e3a-0410-8455-c3a389f83636
Centralized the in flight construction of the TClass


git-svn-id: https://root.cern.ch/svn/root/trunk@48488 27541ba8-7e3a-0410-8455-c3a389f83636