merge this fix from 2.1-dev:

    *) mod_ssl: Fix a problem setting variables that represent the
       client certificate chain.  PR 21371

PR:              21371
Reviewed by:	 nd, jorton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@101252 13f79535-47bb-0310-9956-ffa450edef68