Merge r1803392, r1803396, r1803398 from trunk:

mod_ssl: we can't use SSL_COMP_free_compression_methods() if OPENSSL_NO_COMP
is defined.  PR 61206.

Submitted by: Michael Schlenker <msc contact.de>


mod_ssl, ab: compatibility with LibreSSL.  PR 61184.

LibreSSL defines OPENSSL_VERSION_NUMBER = 2.0, but is not compatible with
all of the latest OpenSSL 1.1 API.

Address this by defining MODSSL_USE_OPENSSL_PRE_1_1_API which is true for
anything but OpenSSL >= 1.1 (for now).

Proposed by: Bernard Spil <brnrd freebsd.org>
Reviewed by: ylavic


Follow up to r1803396: CHANGES entry.


Reviewed by: ylavic, jim, covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1807734 13f79535-47bb-0310-9956-ffa450edef68