GUACAMOLE-423: Update libtool version info for libguac (interfaces added, none changed/removed).
GUACAMOLE-423: Update libtool version info for libguac (interfaces added, none changed/removed).

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