Fixes for ROOT master

Marco Clemencicrequested to merge
clemenci/Gaudi:fix-for-root-master into master
  • explicitly include TObjString.h
  • link GaudiExamples against libROOTHist.so for ROOT::Experimental::RHist
  • add workarounds for ROOT-10769, ROOT-10770, ROOT-10771
Edited by Marco Clemencic

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