wrong rc.subr on arm64 14.4-stable

A Pi4 upgraded via source to 14.4-stable failed to reach multi-usser
 after upgrade, reporting that run_rc_scripts wasn't found.

Eventually it developed that replacing /etc/rc.subr with a version from 
-current fixed the problem. This lesson came from a forum post:
https://forums.freebsd.org/threads/updating-to-15-0-with-source.102467/

I never tampered with /etc/rc.subr and used etcupdate -p after buildworld
followed by etcupdate after installworld. Might this have been caused by
not using etcupdate -B following installworld? There were no merge conflicts
and /etc/rc.subr was dated the same day as the install.

Thanks for reading!

bob prohaska