Revert "clean setuptools from colliding files - it is not using buildPythonPkg"

This reverts commit 9bc390eb7b9bcbe8b4951797010efd27afbe7afd.

svn path=/nixpkgs/branches/stdenv-updates/; revision=32661

pkgs/development/python-modules/setuptools/default.nix

@@ -18,9 +18,6 @@ stdenv.mkDerivation rec {
       mkdir -p $dst
       PYTHONPATH=$dst:$PYTHONPATH
       python setup.py install --prefix=$out
-      # remove generic files, leave setuptools.pth
-      rm $dst/site.py*
-      rm $dst/easy-install.pth
       wrapPythonPrograms
     '';