Clean up our OpenSSL 1.1 support.
In an ideal world, we should support OpenSSL 1.1 built with the deprecated APIs entirely disabled. Additionally while the code that uses the new opaque wrappers for the RSA stuff is functional and maintainable, it would be cleaner if we provided our own wrappers for a more unified codepath.
Neither of these are high priority as the current code works, the changes suggested would just make things better.
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