Merge r1229021 from trunk:

Core configuration: add AllowOverride option to treat syntax
errors in .htaccess as non-fatal.
PR 52439


Submitted by: niq
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1238698 13f79535-47bb-0310-9956-ffa450edef68