Bug#466771: cpio: does not unpack hardlinks to empty files

[Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>]

tag 466771 fixed-upstream
thanks

This was fix upstream and should work as expected with busybox-1.11.2
See also: http://busybox.net/lists/busybox/2008-July/032213.html