[ZODB-Dev] setup.py --clean issue

[John Belmonte]

In 3.4a1 I noticed that setup.py --clean is leaving some derived files
behind:

$ python setup.py clean --all
running clean
'build/lib.linux-i686-2.4' does not exist -- can't clean it
'build/bdist.linux-i686' does not exist -- can't clean it
'build/scripts-2.4' does not exist -- can't clean it
$ find -name '*.pyc'
./Support/zpkgsetup/__init__.pyc
./Support/zpkgsetup/setup.pyc
./Support/zpkgsetup/package.pyc
./Support/zpkgsetup/cfgparser.pyc
./Support/zpkgsetup/dist.pyc
./Support/zpkgsetup/urlutils.pyc
./Support/zpkgsetup/publication.pyc
./Support/zpkgsetup/build_py.pyc
./Support/zpkgsetup/install_lib.pyc