Convert mod_ssl to the new apr_global_mutex.h API and remove all

uses of apr_lock.h [deprecated]. Tested that I could serve simple
SSL (v3) pages.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@94583 13f79535-47bb-0310-9956-ffa450edef68