Add missing comma to GN build file.

BUG=http://crbug.com/368019
R=rsleevi@chromium.org

Review URL: https://codereview.chromium.org/258193002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/openssl@266682 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed