GUACAMOLE-249: Do not include "extended mode" NLA in security negotiation as negotiation fails (see FreeRDP defaults).
GUACAMOLE-249: Do not include "extended mode" NLA in security negotiation as negotiation fails (see FreeRDP defaults).

apache/guacamole-server,apache/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,apache/guacamole-server