Allow mod_tls to compile on Unix boxes where openssl has already been

installed.
Submitted by:	Gomez Henri <new-httpd@slib.fr>
Reviewed by:	Ryan Bloom


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88115 13f79535-47bb-0310-9956-ffa450edef68