tor: Increase number of max. open file descriptors.
as86: Remove unused package.

Was needed to build mbr.
Remove /var/ipfire/firebuild.

This file provides lots of bogous information and information
about the build system that is not of much interest.
Write /opt/pakfire/db/core/mine in stage2.
Create /etc/system-release in stage2.
cdrom: Update /etc/system-release when needed.