Fix CVE CAN-2005-2700:

Fix CVE CAN-2005-2700:

* modules/ssl/ssl_engine_kernel.c (ssl_hook_Access): Ensure that
renegotiation is performed for a transition from "SSLVerifyClient
optional" to "SSLVerifyClient require".

The boolean "verify_old & SSL_VERIFY_PEER_STRICT" is true if the old
context merely has optional verification configured, since the
definition of SSL_VERIFY_PEER_STRICT is
(SSL_VERIFY_FAIL_IF_NO_PEER_CERT | SSL_VERIFY_PEER).

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@264800 13f79535-47bb-0310-9956-ffa450edef68