Skip cctest/test-lockers/MultithreadedParallelIsolates on windows

It's already marked as FAIL, PASS everywhere anyways.

BUG=v8:3215
LOG=n
TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/221173003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20415 ce2b1a6d-e550-0410-aec6-3dcde31c8c00