Cleanup: it was absolutely stupid for game_wants_statusbar() to be a

Cleanup: it was absolutely stupid for game_wants_statusbar() to be a
function, since it took no parameters by which to vary its decision,
and in any case it's hard to imagine a game which only
_conditionally_ wants a status bar. Changed it into a boolean data
field in the backend structure.

[originally from svn r6417]