Now that Java is happy with our /etc/localtime, there is no reason to set $TZ anymore. (See 945849b86fe33474da569b307d7e5880877491b6, 279248f6c562eb88227d22b824c9324683980b96, 1b5e860f65607b4cc7de4b6b5db95460cf144526.) Fixes #1463.