[mojosetup] Simple patches for handling hardlinks and GNU ././@LongLink entries

[Ryan C. Gordon]

> I found that MojoSsetup tar backend lacks support for hard links and
> long names (GNU tar extension).  Attached as two quick patches I've come
> up with.  Then can probably be improved, but seem to work.  Only tested
> on Unix.

I'll take a look at this soon, too.

--ryan.