Hey Joe.
This is the change that made AVX the minimum supported ISA.
https://gitlab.kitware.com/paraview/paraview-superbuild/commit/f3bbdc1d2a441ccf86498f16b5a818fc5709e6ca
I introduced it because MacOS no longer builds embree with SSE and AVX is quite old now.
For standalone builds you can set(embree_BUILD_ISA SSE2 SSE4D AVX AVX2) in your CMakeCache.txt to get back the SSE support.