Need to add test artifacts to .gitignore

From: Dan Jacques <dnj@google.com>
Date: Dec 12, 2017, 16:17 UTC
Message-ID: <20171212161701.4272-1-dnj@google.com>
In-Reply-To: <xmqqy3mkljq3.fsf@gitster.mtv.corp.google.com>

FYI, I've noticed when building from "pu" that neither the "t/helper/test-print-values" or "t/helper/test-print-larger-than-ssize" testing artifacts added to Makefile in this patch series are not added to "t/helper/.gitignore" like other helpers, resulting in the testing artifact being recognized as an untracked file.

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