Merge r1234848 from trunk:

* server/core_filters.c (ap_core_output_filter): Don't read the entire
  output of a morphing bucket into RAM.

Submitted by: jorton, sf


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1234854 13f79535-47bb-0310-9956-ffa450edef68