domain/openssl does not compile on OpenBSD

[Philip-NLnetLabs]

A report came in with:

I tried installing dnst on OpenBSD 7.7 with:
$ cargo install --git https://github.com/NLnetLabs/dnst.git --branch main --tag v0.1.0-rc1

The errors are:
error[E0599]: no associated item named `ED448` found for struct `openssl::pkey::Id` in the current scope
error[E0599]: no function or associated item named `new_secure` found for struct `BigNum` in the current scope
error[E0599]: no function or associated item named `generate_ed448` found for struct `PKey<_>` in the current scope

The SSL library on this system is:

~ openssl version
LibreSSL 4.1.0