`wayland-backend` falls back to `eprintln!` when its optional `log`
feature is disabled. If a Wayland connection fails while standard error
is unavailable, that fallback panics while trying to report the original
error.

Closes ZED-8BW

Enable the existing `log` feature on `gpui_linux`'s direct
`wayland-backend` dependency. `gpui_linux` already depends on the `log`
facade, so this introduces no new logging system; it routes backend
errors through the configured logger and avoids the secondary
standard-error panic.

Testing performed:

Release Notes:

- Fixed a Linux crash when reporting a Wayland connection error while
standard error is unavailable.