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Geant4 Without VecGeom, master branch (2022.04.20.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:G4WoVecGeom-master-20220420 into master

Updated Geant4 to build without VecGeom once more.

@jchapman, @mbandier, please have a look! I was not entirely sure whether -DGEANT4_USE_USOLIDS:STRING=CONS;POLYCONE should be removed. But since it was added in !916 (merged), this seemed like the way to go. 🤔

Later on we could add a cache variable like ATLAS_BUILD_GEANT4_WITH_VECGEOM to select how G4 would build. But I didn't want to complicate things further in this MR.

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