Merge remote-tracking branch 'origin/8.1' into gobject-introspection
Removed compat support for Pike 7.4.
Compat: Added 7.8::SSL.
This is based on the last version of SSL on the 8.0 branch
that was still compatible with Pike 7.8 (ie before the PEM
Intended use is Crypto API compatibility testing, though it
is probably more competent than the current Pike 7.8 SSL.