How do I determine the ABI string used by pkg?

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From: Mel Pilgrim <list_freebsd_at_bluerosetech.com>
Date: Thu, 02 Mar 2023 07:50:13 UTC

I need to determine the ABI string pkg uses on a given system, and need 
to do so when there are no pkgs installed.

I've read through libpkg/pkg_elf.c and I can see how it's reading ELF 
headers from well-known files.  That's all easy enough to replicate, but 
I'm a bit stuck on how it's determining the arch string for x86.

How/When does pkg decide to use FreeBSD:13:amd64 instead of 
FreeBSD:13:x86:64?  Can I safely assume one or the other?