Minor adjustment for CTAN releases

With the change to "clean" in the build scripts, there is a need to remove
stuff that would otherwise build up building a 'bundle of bundles'. This
may need to be worked on a bit more.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5242 de43f980-851b-0410-b2f7-c40aca1f87e0