Properly only add linker flag for linux/freebsd.
Properly only add linker flag for linux/freebsd.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/195103

git-svn-id: http://src.chromium.org/svn/trunk/src@26343 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2db8aaf79998ff8451b6de22a8ea6499ba2a80b0
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser