Fixed shared_library build on Windows.

BUG=v8:2879
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/24054008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16729 ce2b1a6d-e550-0410-aec6-3dcde31c8c00