BUILD: ssl: make libressl use its own version numbers

LibreSSL causes lots of build issues by pretending to be OpenSSL 2.0.0,
and it requires lots of care for each #if added to cover any specific
OpenSSL features.

This commit addresses the problem by making LibreSSL only advertise the
version it forked from (1.0.1g) and by starting to use tests based on
its real version to enable features instead of working by exclusion.
2 files changed