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LibreSSL 3.5 compatibility

Merged LibreSSL 3.5 compatibility
Hello71/tor:modern-libressl into main
Merged Alex Xu requested to merge Hello71/tor:modern-libressl into main
  1. Jul 19, 2022
  3. Jul 07, 2022
    • Alex Xu's avatar
      LibreSSL 3.5 compatibility · f3dabd70
      Alex Xu authored 
      LibreSSL is now closer to OpenSSL 1.1 than OpenSSL 1.0. According to
https://undeadly.org/cgi?action=article;sid=20220116121253, this is the
intention of OpenBSD developers.

According to #40630, many special cases are needed to compile Tor against
LibreSSL 3.5 when using Tor's OpenSSL 1.0 compatibility mode, whereas only a
small number of #defines are required when using OpenSSL 1.1 compatibility
mode. One additional workaround is required for LibreSSL 3.4 compatibility.

Compiles and passes unit tests with LibreSSL 3.4.3 and 3.5.1.
      f3dabd70