Merge r1726705 from trunk:

mod_filter: Fix AddOutputFilterByType with non-content-level filters.
PR: 58856

Submitted by: Micha Lenk
Reviewed by: covener, jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1781433 13f79535-47bb-0310-9956-ffa450edef68