Add small ascii logo variants for Arch, Crux and Gentoo.
Fixes #112. Rationale: - By default in Slackware, /sbin and /usr/sbin aren't part of the user's PATH. (It's been this way since I started using it in 2004, version 9.1) - `type -p /path/to/binary` works just like it was used with a bare binary name.