From: Florian Weimer on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1144#note_5959...
glibc 2.34 will detect `-march=z14` and refuse to run on z13 or earlier, to
avoid hard-to-diagnose crashes later. We learned the hard way that this very
desirable during the ppc64le bringup.