Merge r1551685 from trunk:

FreeBSD: Disable IPv4-mapped listening sockets by default for versions
5+ instead of just for FreeBSD 5.

PR: 53824

Submitted by: trawick
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1570322 13f79535-47bb-0310-9956-ffa450edef68