setup: try to install our toothpick of setuptools (0.6c12dev) but if that fails then...

setup: try to install our toothpick of setuptools (0.6c12dev) but if that fails then go ahead with whatever setuptools we've got

Ignore-this: b84642cefe2ada09ec1fd064614882f3
Hopefully this will fix the problems that setuptools-0.6c9 can't automatically include pyutil more than once if two different requirements require pyutil, but also let the "dpkg-buildpackage" build work with setuptools-0.6c9.  I guess this will work only if that latter build doesn't require pyutil multiple times.

darcs-hash:6980b1a7ec79c85036d9b8b97f72544660df7ef1