Merge r1561385 from trunk:

Remove wonky and unneeded code. We have access
cross forks, so child processes have access.

When we need true external access, this is something
that APR shm must provide. We should have no
knowledge of APR internals.
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1608757 13f79535-47bb-0310-9956-ffa450edef68