Adding AWS-LC as a supported libcrypto

[prasden]

Hi,

I'm a maintainer at AWS-LC, a libcrypto that is API compatible with OpenSSL. We'd like to add support for AWS-LC as a provider option in OpenVPN3. It would give users a FIPS-validated and post-quantum capable crypto option. The changes would be mostly small compatibility shims for the few API differences and build configuration modifications.

OpenVPN already officially supports AWS-LC and is part of the CI, so we'd be extending this precedent to OpenVPN3. Would you be open to a PR for this?

[schwabe]

Yes. We would be open review/accept a PR that adds AWS-LC support. Keep in mind that OpenVPN3 has a CLA (https://github.com/OpenVPN/openvpn3/blob/master/CLA.md) that you need to agree to.

[prasden]

Noted. Will open the PR when ready, thanks!