fix: typo in macro _AVX_512_ENABLED_BY_OS

[mayeut]

The typo results in a build error when AVX512 is enabled. This should have been caught by CI but CI disables things that can't be tested: rework CI & tests to build everything and skip tests that can't be run. We could probably add a test using Intel SDE in order to test everything but that would be for another PR.

based on #144 which fixes the CI workflow.

fixes #146 fixes #147