GitLab

Now use  system setuptools  if it is  available.  This can  also speed
bootstrapping,  since we  don't need  to download  setuptools  in more
cases.


git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@75593 62d5b8a3-27da-0310-9561-8e5933582275