bug#25438: SLIM does not display an option for dwm

[ng0]

For a system config which includes:

(packages (cons* nss-certs
                 awesome dwm openbox xfce
                 dmenu
                 %base-packages))

I am able to select (via cycling through them with F1 in the
SLIM(?) login screen:
* awesome
* openbox (and variations)
* xfce
* GNOME

dwm is not selectable. Either this list is too long for slim, or
there's some problem with our dwm.
-- 
♥Ⓐ  ng0 -- https://www.inventati.org/patternsinthechaos/