[BusyBox] unarchiving tools reorganised again

[Laurence Anderson]

>So when cpio is working properly i will commit it.

Attached a patch to do hardlinks. Could you test & apply. Sorry about the 
lchown stuff - me being braindead! I support lchmod doesn't exist as all 
links are rwxrwxrwx.

>Its best we treat the issue of tar.c and untar.c seperately to the 
>unarchive diff, it would be a fairly radical change to the existing 
>tar.c and im not sure Erik wants us to mess with tar too much. I was 
>thinking maybe the untar.diff could go in a contrib dir ?

At the moment yes, but I think straight after the next release untar & tar 
should be merged, as our code should work just as well as the origional tar 
code, but its shared.

Laurence
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