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Improve the subprocess restore_signals=True test. (GH-7414)

It wasn't testing functionality.  Now it is (on Linux anyways).
G
Gregory P. Smith committed
5f3d04fa4e9b3c3b0e4807f8516de9365bfed467
Parent: c56b17b
Committed by GitHub <noreply@github.com> on 6/5/2018, 7:00:57 PM