mod_ssl: disable check for client initiated renegotiations with TLS 1.3.

This is already forbidden by the protocol, enforced by OpenSSL, and the
current logic can't work (ssl_callback_Info() may be called multiple times
with TLS 1.3).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1833588 13f79535-47bb-0310-9956-ffa450edef68