archive-zip: add tests for big ZIP archives

Test the creation of ZIP archives bigger than 4GB and containing files
bigger than 4GB.  They are marked as EXPENSIVE because they take quite a
while and because the first one needs a bit more than 4GB of disk space
to store the resulting archive.

The big archive in the first test is made up of a tree containing
thousands of copies of a small file.  Yet the test has to write out the
full archive because unzip doesn't offer a way to read from stdin.

The big file in the second test is provided as a zipped pack file to
avoid writing another 4GB file to disk and then adding it.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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