Adds AVX2/FMA flags to CUDA compilation #844
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Summary
After merging SIMD support, we broke CUDA build.
This PR fixes the problem
Details and comments
We are adding a constraint -- From now onwards (until #843 is fixed) we have to build CUDA wheels packages with AVX2/FMA (SIMD) support, so users installing it will have to make sure their CPUs support these features (which is only a problem for very old CPUs).