gh-148841: Fix test_posix on FreeBSD 15 with zfs filesys

[neek78]

Handle EOPNOTSUPP as well as EINVAL in this case.

• Issue: test_os fails on FreeBSD 15 with zfs filesystem #148841

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[mandree]

I think the patch is confusing, I get the same failure on ZFS, but we'll now skip with a reason it were FFS. Should the two paths be unified to just skip on FFS and ZFS (i. e. with EOPNOSUPP and EINVAL, on all the operating systems, and just use one unified reason?

[neek78]

I think the patch is confusing, I get the same failure on ZFS, but we'll now skip with a reason it were FFS. Should the two paths be unified to just skip on FFS and ZFS (i. e. with EOPNOSUPP and EINVAL, on all the operating systems, and just use one unified reason?

Yes, fair point. I've updated the patch.