Merge r1591472 from trunk:

mod_proxy_fcgi: remove wasted memset() calls and other historical bits

Submitted by: trawick
Reviewed by: jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1594537 13f79535-47bb-0310-9956-ffa450edef68