CLEANUP: ssl-sock: use HA_OPENSSL_VERSION_NUMBER instead of OPENSSL_VERSION_NUMBER

CLEANUP: ssl-sock: use HA_OPENSSL_VERSION_NUMBER instead of OPENSSL_VERSION_NUMBER

Most tests on OPENSSL_VERSION_NUMBER have become complex and break all
the time because this number is fake for some derivatives like LibreSSL.
This patch creates a new macro, HA_OPENSSL_VERSION_NUMBER, which will
carry the real openssl version defining the compatibility level, and
this version will be adjusted depending on the variants.