[mojosetup] Uninstall support!

[Gerry JJ]

Replying to myself..

One problem with the symlink solution that I didn't think of (guh..) is
that additional symlinks to the symlink would have to retain the name
for mojosetup to be able to parse its argv[0].  Somewhat more likely
than renaming existing symlinks perhaps, but it still doesn't sound
like a very common scenario.  Still, maybe placing seemingly arbitrary
restrictions on such things isn't such a good idea? ..

I still like the symlink approach though =/

- Gerry