The current debian/control file and other packaging of 10.5 targets the
latest Debian unstable. In autobake-deb.sh there are automatic build
adaptations for older Debian/Ubuntu releases.

Some adaptations were for Debian versions prior to Jessie and Ubuntu
versions prior to Trusty. Those distro releases are no longer supported
anyway, so these should be cleaned away now in the 10.5 release cycle.

Summary:
- Debian Jessie has libcrack2 release 2.9.2-1, no need to have adaptations
  for any older environments
- Debian Jessie has libpcre3-dev release 2:8.35-3.3, no need to consider
  older versions
- Systemd has been available since Debian Jessie, no need to consider
  that a Debian/Ubuntu environment would not have it available
  adaptations for environments for anything older