Merge r1604631 from trunk:

Follow up to r1604336: Comment out hooks whose only references are
now commented out, fixing a "-Wunused-function" warning


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1604633 13f79535-47bb-0310-9956-ffa450edef68