JH/10 GnuTLS: fix for (IOT?) clients offering no TLS extensions at all.
Find and fix by Jasen Betts.
+JH/11 OpenSSL: fix for ancient clients needing TLS support for versions earlier
+ than TLSv1,2, Previously, more-recent versions of OpenSSL were permitting
+ the systemwide configuration to override the Exim config.
+
Exim version 4.96
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