Remove mod_authn_default and mod_authz_default.

Note: I've attempted to work through the Windows and Netware build files,
but if those with such systems could repair any damage, that would be
appreciated.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@709839 13f79535-47bb-0310-9956-ffa450edef68