test-lib: preserve GIT_CURL_VERBOSE from the environment
Turning on this variable can be useful when debugging http tests. It does break a few tests in t5541, but it is not a variable that the user is likely to have enabled accidentally. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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