complain via error_log when mod_include's INCLUDES filter is

     enabled, but the relevant Options flag allowing the filter to run
     for the specific resource wasn't set, so that the filter won't
     silently get skipped. next remove itself, so the warning will be
     logged only once
PR:
Obtained from:
Submitted by:
Reviewed by:	Jeff Trawick, Bill Rowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@102010 13f79535-47bb-0310-9956-ffa450edef68