Fix errors and warnings when building on LCG 97

Rosen Matevrequested to merge
rmatev-LCG97-build into master
  • Add libunwind to link libraries of GaudiOnlineExe and GaudiCheckpoint
  • Remove deprecated -c (noop) flag in rootcling call
  • Fix warnings from updated range v3
  • Add .gitignore and .gitattributes from LHCb
Edited by Rosen Matev

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