Support for OpenSSL 1.1.0:

- ab: use new API SSL_CTX_set_max_proto_version()
  and SSL_CTX_set_min_proto_version() in
  combination with TLS_client_method() instead
  of the old deprecated methods.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1735891 13f79535-47bb-0310-9956-ffa450edef68