Make it compatible with new setuptools OBS-URL: https://build.opensuse.org/request/show/1266265 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/python-zope.deferredimport?expand=0&rev=7
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-zope.deferredimport?expand=0&rev=15
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-zope.deferredimport?expand=0&rev=14