Use a portable way to get the relative paths into __FILENAME__

ci: Print the locals before running

ci: Remove openbsd job for now

[skip ci]

CI: refactor, and enable some specific test only on the master project

Because some of the jobs (the one using ssh runners, freebsd and openbsd)
use runners that are only available on my own project and not forks (for
security reasons), and some other jobs (coverity and sonar-qube) use private
variables to be able to run.  So, all these jobs would fail if run on a fork
project.

Add some missing includes

Force the freebsd build to use clang++

ci: Don’t display g++ and clang++ --version

ci: don’t set the locale env variablesx

Add a freebsd ci test

e2e: Accept even more unordered things in the connection sequence

Avoid a potential nullptr dereference

CI: add the docker tag for coverity and sonar-qube jobs

In the docker images, use port 1113 for charybdis’ identd connection

Update the verify_certificate_chain code to work with botan >= 1.11.34 as well

Add a missing ifdef botan

Add some missing botan includes

Clean a few more things

Use the new botan 1.11.32 Tls::Client API (but stay compatible with older ones)

TLS: Enable ecc point compression

If available in Botan.

There is an issue where, if botan supports it but we don’t enable it, then
the TLS handshake may fail with some servers

Do not fail to build if litesql is not there