VecGeom ARM Compatibility, master branch (2022.02.01.)
Removed the unnecessary settings from the VecGeom build configuration. The x86 instuction set and "geometry backend" were both set to their default values (on x86_64) explicitly earlier. By not setting them at all, they will now find their default values on ARM as well. Thereby fixing the issue described in ATLINFR-4411.
At the same time removed the explicit setting for the build system generator for VecGeom, and added the "extra options" simply to CMAKE_CACHE_ARGS as well.