Drop support for OpenSSL < 1.1.1
As of 1 January 2020, there will be no supported OpenSSL version earlier than version 1.1.1. (See https://www.openssl.org/policies/releasestrat.html)
We can clean up our code by dropping backward-compatibility support for earlier versions.
As we do this, we should test with supported versions of LibreSSL as well, since we try to support that too.
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