Merge r1840710 from trunk:

* modules/ssl/ssl_engine_init.c (ssl_init_ctx_protocol):
  Disable AUTO_RETRY mode for OpenSSL 1.1.1, which fixes
  post-handshake authentication.
  (ssl_init_proxy_certs): Fix proxy client cert support with
  TLSv1.3, which is now crippled by default.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/tlsv1.3-for-2.4.x@1840711 13f79535-47bb-0310-9956-ffa450edef68