GUACAMOLE-1191: Always disable the glyph cache, as FreeRDP no longer considers the feature to be stable.
GUACAMOLE-1191: Always disable the glyph cache, as FreeRDP no longer considers the feature to be stable.

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