setuptools needs to be installed globally

In [name_from_setup()](https://github.com/reinout/z3c.dependencychecker/blob/master/src/z3c/dependencychecker/dependencychecker.py#L137) the name of the package is retrieved by calling `pythonX setup.py --name`, which requires `setuptools` to be installed globally.

Is there a possibility to do this without having `setuptools` installed globally?

Because of the version conflicts and the new buildout versions I've removed everything from site-packages (including distribute, pip, easy_install, setuptools, etc).
It works well in general (I've less buildout problems) but now I can no longer use `z3c.dependencychecker` because of the missing `setuptools`.

Would be very happy to change this to an isolated way, so that I can keep the empty site-packages - but I've no idea how this could be done properly :/

An idea?