This is so it can be shared with Qt.
If, for some reason, we have to cut another source tarball for
3.4.0, then this will be included. Otherwise, this will
turn out to be a post-3.4.0 patch.
> marked as "placeholder." It is the tile for Neferet the Green,
> a green-colored wizard for the updated Wizard's quest.
It's not great, but the best I can do without her looking like some
sort of Zombie (most of the tiles try to follow rules - dark-green=zombie,
green=gnome, blue=dwarf, etc. in order that the player can recognize the
patterns, rather than concentrating too much on the details).