[sr-dev] [kamailio/kamailio] [tls] Don't use OpenSSL<1.0.2 fallback on 1.1+ (#2717)

[space88man]

Address GH #2716. Also see https://bugs.python.org/issue29697.

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#### Checklist:
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#### Description
For OpenSSL 1.1.x initialization of EC SSL contexts has changed — we should be using the < 1.0.2 technique on OpenSSL 1.1+. This addresses a corner case where TLS server with P-256 cert would not handshake with a TLS client presenting a P-521 cert.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2717

-- Commit Summary --

  * [tls] Don't use OpenSSL<1.0.2 fallback on 1.1+

-- File Changes --

    M src/modules/tls/tls_domain.c (12)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2717.patch
https://github.com/kamailio/kamailio/pull/2717.diff

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