t7063: hide stderr from setup inside prereq
When t7063 starts, it runs "update-index --untracked-cache" to see if we support the untracked cache. Its output goes straight to stderr, even if the test is not run with "-v". Let's wrap it in a prereq that will hide the output by default, but show it with "-v". Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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