AthSimulation CMake Fixes, 24.0 branch (2024.02.28.)
Make it possible to use AthSimulation / AthSimulationExternals from CVMFS. As reported in ATLINFR-5262, it doesn't currently work.
One has to tell AtlasLCG to not look for any "generator packages", and one also has to make sure to set up LCG early enough during the CMake configuration when calling find_package(AthSimulation)
. Some of the details are explained a bit more in both ATLINFR-5262, and in atlasexternals!1104 (closed). (At first I thought I should make changes in the externals code as well. But I no longer think that...)