Jeff King authored May 13, 2016 and Junio C Hamano committed May 13, 2016

These variables were added in 16805d3e

 (t/t91XX-svn: start
removing use of "git-" from these tests, 2008-09-08) so that
running:

  git grep git-

would return fewer hits. At the time, we were transitioning
away from the use of the "dashed" git-foo form.

That transition has been over for years, and grepping for
"git-" in the test suite yields thousands of hits anyway
(all presumably false positives).

With their original purpose gone, these variables serve only
to obfuscate the tests. Let's get rid of them.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>