Comment 5 for bug 1669578

For screen, we'll need to fix their own checking logic a bit but we'll work on that patch and send it upstream (and have it also deal with just getting ENODEV while we're at it).

With the fixed glibc screen reports "Bad tty '/proc/self/fd/0'" because of it trying to readlink the path it's receiving from ttyname(), that's an unneeded step and in fact breaks on Linux when dealing with cross-namespace pts devices.