Merge r1393033 from trunk:

mod_include: When +Includes is not set and we disable mod_include, tell
the administrator where this happened.

Submitted by: minfrin
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1394026 13f79535-47bb-0310-9956-ffa450edef68