This allows for compiling third-party code (such as ICU) with less
strict flags.

BUG=v8:2745
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18181006

Patch from Jochen Eisinger <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15389 ce2b1a6d-e550-0410-aec6-3dcde31c8c00