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Fixed CMakeLists.txt to work on a local install

Ben Couturier requested to merge fix_cmake_for_local_install into master

In order to investigate and fix the GDML export/import issues, I need a setup where I can compile DDUPgrade against the master of ROOT, Geant and DD4hep. I am doing this on a Ubuntu 18.04 node without LCG and I am checking that the CMakeLists.txt is functional. I had to add a new CMake option (LCG_EXTERNALS_MODE, defaulting to ON). Setting it to off disables the search of DD4hep with the LCG specific directory structure.

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