* modules/ssl/config.m4: Use libtool's -export-symbols-regex flag to

hide all global symbols defined by mod_ssl other than the module
structure (where possible).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@105740 13f79535-47bb-0310-9956-ffa450edef68