case-insensitive filesystems possibly not showing up in the default
working set, due to differing normalizations of ``sys.path`` entries.
(backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4050757