Revert "Disable veccore option rather than enable builtin_veccore by default"
Revert "Disable veccore option rather than enable builtin_veccore by default"

This reverts commit 970be6a29d95da581408df735a46f091e7efabcd.

root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,karies/root,karies/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root