The server was updated in a6fee2f18ef9d2ef6ac248e9ed82d580daff1a07
(3.0-dev~1674) and e701f208619b8b9b28a85f84ee16cf8d8df82b72
(3.0-dev~1667) to avoid relying on this wrapper. We no longer support
servers older than 3.0, so we can delete it.
Signed-off-by: Anders Kaseorg <anders@zulip.com>