* Fix a regression from r724717 by reintroducing SSL_CLIENT_S_DN,

  SSL_CLIENT_I_DN, SSL_SERVER_S_DN, SSL_SERVER_I_DN back to the environment
  variables to be set by mod_ssl.

Submitted by: Peter Sylvester <peter.sylvester edelweb.fr>
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@820401 13f79535-47bb-0310-9956-ffa450edef68