Update logic to choose manifest from manifest list to check for os version on Windows. Separate the logic for windows and unix to keep unix logic the same. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (cherry picked from commit 38aef56e1fcb8ea318df98c89cf002267b88a136) Signed-off-by: John Stephens <johnstep@docker.com>