[llvm] [LLVM] [Support] Query the terminal width using the termios API (PR #143514)

[via llvm-commits]

Sirraide wrote:

> LLVM Buildbot has detected a new failure on builder `llvm-clang-win-x-armv7l` running on `as-builder-1` while building `llvm` at step 15 "test-check-cxx-armv7-unknown-linux-gnueabihf".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/38/builds/3964
> 
> Here is the relevant piece of the build log for the reference

This builder seems to be back to normal now, so that was unrelated.

https://github.com/llvm/llvm-project/pull/143514