apr optional functions do not need to be unregistered
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90625
13f79535-47bb-0310-9956-
ffa450edef68
o Cleanup ssl_engine_io.c !!
o Port all remaining code (code inside #if 0...#endif blocks)
- o Enable the use of ssl_var_lookup (and other ssl_var_* functionalities).
- o Whether to unregister and how to unregister?
- ssl_var_unregister();
- ssl_ext_unregister();
o Do we need SSL_set_read_ahead()?
o Enable use of MM, SHMCB and SHMHT.
o Enable SSL extensions (ssl_engine_ext.c)