b4e39e4ff9
On unix systems, we were trying to determine the terminal width using
the `COULMNS` environment variable. Unfortunately, `COLUMNS` is not
exported by all shells and thus not available on some systems.
We were previously using `ioctl()` for this; fall back to doing so if `COLUMNS`
does not exist or does not store a positive integer.
This essentially reverts a3eb3d3d92 and
parts of https://reviews.llvm.org/D61326.
For more information, see #139499.
Fixes #139499.
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