Corrected the path to src/include/httpd.h, as suggested by

Brian Reichert <reichert@numachi.com>

PR: 2359
Submitted by: Brian Reichert <reichert@numachi.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@81836 13f79535-47bb-0310-9956-ffa450edef68