This fixes standalone command-line Xcode compilation with Xcode 5.x.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/138443008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18785 ce2b1a6d-e550-0410-aec6-3dcde31c8c00