sysutils/lsof: Unbreak for 12.2-RELEASE and newer 13.0-CURRENT

The the order of fields in the namecache struct changed in stable/12
(r363891) and head (r367338); this definition is not public so lsof
has it's own copy that needs to be conditionally adjusted accordingly.

PR: 250916
Approved by: ler (maintainer)