Fix special RewriteCond "-s" pattern matching.

Submitted by: Bob Finch <bob@nas.com>
Reviewed by: Ralf S. Engelschall


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83107 13f79535-47bb-0310-9956-ffa450edef68