Restrict fcntl(2) commands on x64. Restrict the permissible flags for F_SETFL.

Continuation from https://codereview.chromium.org/15203008/ which wasn't landed.

BUG=241215
R=jln@chromium.org

Review URL: https://codereview.chromium.org/15439002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201160 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed