Ignore a deque test on windows

I've seen this fail on windows twice now, and it's not clear to me why it's
failing. For now, ignore it on that platform while investigation enuses.
auto merge of #10733 : alexcrichton/rust/ignore-on-windows, r=pcwalton

I've seen this fail on windows twice now, and it's not clear to me why it's
failing. For now, ignore it on that platform while investigation enuses.