bpo-46000: improve NetBSD curses compatibility

[0-wiz-0]

https://bugs.python.org/issue46000

[the-knights-who-say-ni]

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@0-wiz-0

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[serhiy-storchaka]

Please add a NEWS entry (you can use https://blurb-it.herokuapp.com/ for it).

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @serhiy-storchaka for commit 594a9f4 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[miss-islington]

Thanks @0-wiz-0 for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9, 3.10.
🐍🍒⛏🤖

[bedevere-bot]

GH-30022 is a backport of this pull request to the 3.10 branch.

[bedevere-bot]

GH-30023 is a backport of this pull request to the 3.9 branch.

[0-wiz-0]

Thanks for all the help, @miss-islington & @serhiy-storchaka!