[PATCH] contrib/dmenu/passmenu: add support for dmenu-wayland

[jman]

I wrote:

> This patch adds a condition to check if $WAYLAND_DISPLAY is set. If yes
> If yes we assume we are in Wayland window manager and switch to use
> dmenu-wayland instead of dmenu.

I'm not 100% sure this patch was not already submitted in the past, but
a search in the git repo shows nothing similar. In case, just ignore
it. If not, it would be nice to merge it :)

Thanks for any feedback!

cheers,