[ci] Build with veccore=ON and vc=ON

[guitargeek]

Let's see with the CI if this issue is still a thing (we have an march=native build):

https://its.cern.ch/jira/browse/ROOT-10614

[github-actions]

Test Results

    16 files      16 suites   2d 18h 41m 15s ⏱️
 3 037 tests  3 036 ✅ 0 💤 1 ❌
48 173 runs  48 171 ✅ 0 💤 2 ❌

For more details on these failures, see this check.

Results for commit d5d1118.