patch: unzip succeeds with CRC errors

[Paul Fox]

 > busybox tar behaves like busybox unzip did -- it reports the error,
 > and exits successfully.  having just fixed this in unzip, i'll take
 > a look at tar.

i looked, and i can say that i definitely don't have time.  the 
layering is deeper than it was with unzip, and the retesting more
time-consuming.  someone else can handle this one.

paul
=---------------------
 paul fox, pgf at brightstareng.com