mod_ssl: Add new directive SSLCompression to disable

TLS-level compression.

PR 53219.

Backport of r1345319 and r1348656 from trunk.

Submitted by: Bjoern Jacke <bjoern j3e de>, sf
Reviewed by: rjung, trawick
Backported by: rjung


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1369585 13f79535-47bb-0310-9956-ffa450edef68