[perl #126876] [BUG] t\spec\S32-io\io-spec-win.t fails on Windows 10 with MSVS 2013

[Brent Laabs via RT]

> Pull request submitted. I hope this is the right place to do that:
> 
> https://github.com/perl6/roast/pull/87

I approved the pull request.  If the tests pass on Windows, this ticket can be 
resolved.