for mswin. We tried to increase timeout and execute separately but both
didn't work. Let me skip this until somebody starts to work on fixing
this behavior, since this makes AppVeyor almost impossible to be used as CI.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64943 b2dd03c8-39d4-4d8f-98ff-823fe69b080e