This is a very nice and life-saving script to clean up a tree (much like what git clean does):
I think it would help developers a lot if this script can be installed into /usr/bin in the subversion.spec
This isn't packaged in the tarball.
$ tar -tjf subversion-1.7.8.tar.bz2 | grep svn-clean
Packaging stuff other than what's in the tarball is a maintenance headache so I'd prefer not to do more of it.