[BusyBox] Unzip applet

[Laurence Anderson]

Been working on a mini unzip program for busybox unstable series. Tested
it with quite a few zip files, and seems to work ok. It does add a line
to unarchive.c which was unavoidable, to allow a function to be called
to inflate the file, I used a function pointer so unzip.c would only be
compiled in if required. unzip.c is also modified a bit, to move more
format independant code to inflate(), and to make inflate public, but
the size should remain similar.

Attached the patch. Could it go into CVS?

Laurence
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