Merge r1787525, r1787553, r1788451 from trunk:

Merge r1787525, r1787553, r1788451 from trunk:

Add IndexOptions UseOldDateFormat

  *) mod_autoindex: Add IndexOptions UseOldDateFormat to allow the date
     format from 2.2 in the Last Modified column. PR60846.

   PR34014 / r903052 changed date format for autoindex

Submitted By: Hank Ibell <hwibell gmail.com>

update comments post-r1787525

no strncasecmp because flag has no value

Submitted by: covener
Reviewed by: covener, jim, druggeri

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1789963 13f79535-47bb-0310-9956-ffa450edef68