Hide include directive from ROOT5 interpreter

[klendathu2k]

Proposed fix for Issue #455

It is not clear to me from the tests I've done on issue #455 why StBFChain/StBFChain.h is not located in the include path by root5 / cint. Simplest fix is to hide the include directive from CINT.

[plexoos]

There is no reason to hide the header from ROOT5/CINT and the CI tests confirm just that. The reason why ROOT5/cint can't find the header is because ROOT5 is not given the paths to search for it in interpreter mode. It is done by using gInterpreter->AddIncludePath() as in #441 . I don't really understand the resistance to update the rootlogon.C macro to include those lines... I think the same effect can be achieved if one adds these calls directly to the bfc.C macro before calling gSystem->ProcessLine()...

My point is that we should minimize the branching of the code for ROOT5 and ROOT6 and use #ifdefs only if nothing else works.

[klendathu2k]

Agreed. I had not appreciated that the gInterpreter -> AddIncludePath(...) function only accepted one path at a time. Will close this PR.

[plexoos]

Having no control over the system-wide root config files, this seems like a viable solution (at least for now)

[genevb]

Seems OK to me.