Fixed the ServerSignature directive to work as documented.

PR: 4248
Submitted by:	Raymond S Brand <rsbx@rsbx.net>
Reviewed by:	Martin Kraemer


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83125 13f79535-47bb-0310-9956-ffa450edef68