When running DAV tests on Windows, don't try to load mod_authn_core for Apache 2.2, as that module only exists in 2.3.
When running DAV tests on Windows, don't try to load mod_authn_core for
Apache 2.2, as that module only exists in 2.3.

* win-tests.py
  (Httpd.__init__): Only load mod_authn_core.so for Apache versions 2.3+.

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