Add "SSLHonorCipherOrder" directive to enable the OpenSSL 0.9.7 flag

Add "SSLHonorCipherOrder" directive to enable the OpenSSL 0.9.7 flag
which uses the server's cipher preference order rather than the
client's.

* modules/ssl/ssl_private.h (struct SSLSrvConfigRec): Add
cipher_server_pref field.

* modules/ssl/ssl_engine_config.c (ssl_config_server_create,
ssl_config_server_merge): Initialize and merge cipher_server_pref
field.
(ssl_cmd_SSLHonorCipherOrder): New function.

* modules/ssl/ssl_engine_init.c (ssl_init_ctx_protocol): Set the
context option SSL_OP_CIPHER_SERVER_PREFERENCE when required.

PR: 28665
Submitted by: Jim Shneider <jschneid netilla.com>

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@103832 13f79535-47bb-0310-9956-ffa450edef68