RFR for JDK-6963118 Intermittent test failure: test/java/nio/channels/Selector/Wakeup.java fail intermittently (win)

[Alan Bateman]

I didn't see any more on this one but I think it would be good to get it 
fixed and removed from the exclude list. Here's a slightly modified fix 
that might be a bit clearer:

   http://cr.openjdk.java.net/~alanb/6963118/webrev/

If we can agree this then I'll get it into jdk9/dev.

-Alan.