bpo-46446: Like FreeBSD, MULTIARCH should not be passed on OpenBSD

[kmosiejczuk]

Add a line to stop passing MULTIARCH on OpenBSD just like was done for FreeBSD

https://bugs.python.org/issue46446

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[encukou]

@kmosiejczuk, did you mean to close this PR?

I only got to it today, but, seeing that it is in the OpenBSD patches, I'd have merged it.

[kmosiejczuk]

@kmosiejczuk, did you mean to close this PR?

I only got to it today, but, seeing that it is in the OpenBSD patches, I'd have merged it.

Honestly, I don't remember closing it, but that was two and a half years ago. I'll reopen it.

[python-cla-bot]

All commit authors signed the Contributor License Agreement.

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.

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