Some Linux distros can backport features due to security issues while keeping the same (old) version. See e.g.: - RHEL 7, https://rhn.redhat.com/errata/RHSA-2015-2159.html - RHEL 6, https://rhn.redhat.com/errata/RHBA-2016-0842.html - Remi PHP 7.0.x, https://github.com/remicollet/remirepo/commit/87954ef9ca41
This patch adds logic to test whether or not the libcurl (used by PHP/cURL) was compiled against a compatible SSL/TLS library.