[Sheriff] Revert "Sync cygwin version with chromium"

This reverts commit r18392 for breaking python compatibility on windows bots.

BUG=
TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/110993006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18419 ce2b1a6d-e550-0410-aec6-3dcde31c8c00