win: Remove call to deprecated GetVersionEx Bug: chromium:1255114 Change-Id: Ie0539205d5547b1da05ec957096a369f7d9ababe Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3206017 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>