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Free peer-reviewed portable C++ source libraries

fixes #12615

- Ref https://github.com/k3s-io/k3s/releases/tag/v1.20.6%2Bk3s1
- Fixes (CVE-2021-25735) Validating Admission Webhook does not observe some previous fields. Resolved in upstream PR.

This was caused by switching to x.py dist in 04ecd3b0.  Because we
use fakeroot, tar extracted the artifacts with --same-owner.  As a
workaround, we use --no-same-owner.

I took them from the Fedora repository.