links: bump to version 2.3pre1

* Switch to links 2.3pre1.
* Enable graphics mode via directfb.

TODO: Support X11 mode, maybe linuxfb (requires gpm).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>