test-lib: factor out $GIT_UNZIP setup
We set up the $GIT_UNZIP variable and lazy prereq in multiple places (and the next patch is about to add another one). Let's factor it out to avoid repeating ourselves. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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