COMP: Update setuptools to support parallel install. See #3757

This commit removes the complex and un-maintainable "lock" mechanism
first introduced in r23465. Instead it updates the version of setuptools
to use a patched version able to support parallel build.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23474 3bd1e089-480b-0410-8dfb-8563597acbee