Add fido/u2f support for FreeBSD.

Also adds test target.

This was merged upstream, so patches can be removed from files/
on the next release of python-fido2.

See:
https://github.com/Yubico/python-fido2/pull/64
https://github.com/Yubico/python-fido2/commit/19c86d5459931b8a76d1adc76420a8a1e0c0cf2e

PR: 240476
Approved by: koobs (python: maintainer)