Apache httpd 2.4.37 does not start with mod_ssl and libressl 2.7.4
As reported at https://github.com/docker-library/httpd/issues/115 the latest httpd does not start with enabled mod_ssl and libressl 2.7.4
I suppose this is related to introduced TLS 1.3 support, the 2.8.x branch of libressl has a bunch of fixes for TLS 1.3 compatibility https://github.com/libressl-portable/portable/blob/master/ChangeLog
We should update libressl to 2.8.x
(from redmine: issue id 9741, created on 2018-12-10, closed on 2019-03-05)