Allow this test to fail again.

For other's sanity, allow this test to continue to fail on cygwin until we fix
it to be more portable and look into whether qio makes similar assumptions.
Merge pull request #988 from lydia-duncan/allowQioTestToFailAgain

Allow this test to fail again.

For other's sanity, allow this test to continue to fail on cygwin until we fix
it to be more portable and look into whether qio makes similar assumptions.