Workaround the bug in `displaysize(tty)` on closed TTY

[tkf]

I had this segfault issue JuliaLang/julia#34620 while writing https://github.com/tkf/TmuxDisplays.jl. I think we'd better "vendor" JuliaLang/julia#34623 and then define some kind of fallback when the stream is closed. See also JuliaLang/julia#26687

[c42f]

Sure, sounds good to vendor that fix behind a VERSION check.