This stops us from erroneously adding "squeeze-lts" to "oldstable" which is now "wheezy", not "squeeze" (but "oldoldstable" _is_ squeeze, hence the new check on `/etc/debian_version` being `6.*` instead, and done as a `case` for the eventual addition of `wheezy-lts`, etc). Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com> Upstream-commit: c64466fb68c1ef204b8dc0759da62398a3372732 Component: engine