System cleanup

[Faré]

> Looking at the test suite, I see this test specifically aimed to check this:
>
> (eval `(def-test-system test-defsystem-depends-on-4
Using
git log test/test-defsystem-depends-on.script
it looks like this is https://bugs.launchpad.net/asdf/+bug/1445638
Looking for that bug in git log, it was fixed in 3.1.4.5 on 2015-04-23.

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