Merge r1556473 from trunk:

* modules/ssl/ssl_engine_config.c (ssl_cmd_SSLCompression): Fail if
  enabled *and* if OpenSSL does not make any compression methods
  available.  Tweak wording for failure without SSL_OP_NO_COMPRESSION.

Submitted by: jorton
Reviewed by: jorton, jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1823625 13f79535-47bb-0310-9956-ffa450edef68