openjdk8 is currently not build for armhf.

This is the only binary needing linux-pam.

This depends on ruby-nokogiri which is only available in community.
Packages from main can't depend on packages from community.

See also: ea6a7e16

Besides busybox cron already uses /run/crond.pid

cron is the name of a virtual service and a real service. This causes a
non-fatal error with the most recent OpenRC version. This error appears
everytime openrc updates the dependency tree this can be triggered
manually by calling rc_deptree_update(3).

Renaming the busybox cron service fixes this error, however, this breaks
backwards compatibility.