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Force VecGeom to use globally set instruction set

Benedikt Hegner requested to merge hegner/lcgcmake:master into master

VecGeom is the first package to use vector instructions. Depending on the machine LCG is built, the result is a different one. This MR forces a pre-defined instruction set to be used. Using march=generic spoils the idea of testing vecgeom, thus I went for sse4.2 as default. This architecture is deployed in 90 % of the Grid resources.

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