One more (final) of "Resurrect the trunk" series:

Implement a shortcut for the deserialized decls to codegen. We do not need to put
the deserialized declaration in a transaction, because they are not interesting.
They are valid so we don't need to do sanity checks and if we'd want to unload
we would unload the entire PCH/PCM, which contains a list of all the deserialized
declarations.

NOTE that the implementation is rough and needs further polishing, which will 
happen some time soon...


git-svn-id: https://root.cern.ch/svn/root/trunk@49076 27541ba8-7e3a-0410-8455-c3a389f83636
From Gerri:
Make sure that XROOTD_PRIVATE_INCLUDE_DIR is not undefined.


git-svn-id: https://root.cern.ch/svn/root/trunk@49077 27541ba8-7e3a-0410-8455-c3a389f83636