Tests run under PyPy3 fail due to curses / ctype assertion

[Tres Seaver]

This bug against PyPy:

  https://bitbucket.org/pypy/pypy/issue/1946/cursesinitscr-raises-ctype-typeerror

Blocks adding PyPy3 support for packages which use zope.testrunner under tox / Travis:

- zope.annotation
- zope.applicationcontrol
- zope.authentication
- zope.browsermenu
- zope.browserpage
- zope.browserresource
- zope.cachedescriptors
- zope.component
- zope.componentvocabulary
- zope.container
- zope.copypastemove
- zope.deferredimport
- zope.dublincore
- zope.exceptions
- zope.formlib
- zope.i18n
- zope.index
- zope.login
- zope.pagetemplate
- zope.password
- zope.principalregistry
- zope.publisher
- zope.ramcache
- zope.securitypolicy
- zope.security
- zope.site
- zope.size
- zope.tales
- zope.tal
- zope.traversing

[Marius Gedminas (mgedmin)]

Also filed as https://github.com/zopefoundation/zope.testrunner/issues/24

Fixed in zope.testrunner 4.4.7.