Fix post-AOT cleanup to use package-based deletion heuristic.
Fix post-AOT cleanup to use package-based deletion heuristic.

We had it so every .class file had to correspond with a .clj file in
src/, but sometimes there are outliers that don't match up. So instead
we now ensure that there's a directory in src/ that matches the
package of each .class file.

0/leiningen,0/leiningen