Merge the last of the 'filtering' functions into ssl_engine_io.c, merge
  ssl_abort into what was ssl_hook_CloseConnection, clean out a bunch of
  now-static or private headers from mod_ssl.h, and final fix a very small
  but potent segfault if ->pssl is destroyed within our read loop.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97411 13f79535-47bb-0310-9956-ffa450edef68