Text to go in the release notes:
This enhancement removes the script misc/kohalib.pl.
The purpose of this script was to load the relevant Koha lib for the different scripts (installation, cronjob, CLI, etc.). However, it is not used consistently and we prefer to rely on PERL5LIB.
If upgrading ancient Koha systems from tarballs double-check that PERL5LIB is set in crontab.