Detect {Libre,Open}SSL functions availability during configure

[rgacogne]

Short description

Instead of using version numbers, which is brittle, notably because LibreSSL faked the OpenSSL version numbers at some point without implementing all the newly introduced functions.

Fixes #8739.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[rgacogne]

@omoerbeek This is low priority but, if you don't mind, I would really appreciate it if you could check that this doesn't break anything on OpenBSD :-)

[omoerbeek]

auth, dnsdist and rec configure and build show no surprises.