Ticket40165 035: Fix OpenSSL3 deprecation warnings

Nick Mathewsonrequested to merge
nickm/tor:ticket40165_035 into maint-0.3.5

Fixes #40165 (closed). Fixes #40170 (closed).

Merges cleanly forward to master; see https://github.com/torproject/tor/pull/2100 for CI on master.

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