When ve/ support was introduced, a simple "make icewm.iso"
had to turn into the more elaborate "make distro/icewm.iso".
This latter one involves several keystrokes more, which is
not even (environ)mentally friendly.

This was supposed to get fixed somewhere down the road with
a fallback but the elegance of IMAGE_* setup waterfall barred
me from tweaking IMAGE_TARGET at once (and the downstream fixup
would imply re-tweaking the consequent variables as well which
is blatantly anti-mkimage-profilic being a brute fork).

OTOH testing for a "directory" part of the goal is going to
either deadlock on IMAGE_CLASS or duplicate its assignment.

So now when I've had enough typing an extra "distro/",
I'm going to just bite the bullet and tweak IMAGE_TARGET
with a test duplicating IMAGE_CLASS assignment indeed
(testing for e.g. "/" results in a different test,
which would be worse yet).

Please suggest a more elegant solution if you invent one!