Check live-build 2.x special casing for Wheezy and others

live-build 2.x doesn’t know about Jessie. It might have special-casing for e.g. Wheezy (i.e. the “next” Debian release back when live-build 2.x was being developed), that should be applied to Jessie too.

Parent Task: #7559 (closed)

Original created by @intrigeri on 7592 (Redmine)