[Bug 280705] 0.0.0.0/32 is equivalent to 127.0.0.1/32, which may be considered a security flaw

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280705

--- Comment #2 from Eirik Oeverby <ltning-freebsd@anduin.net> ---
Some rudimentary testing - on my own retro hardware and on copy.sh/v86/ - it
seems that many OSes with IP stacks of BSD origin share this trait. Notable
exceptions are OpenBSD and Windows 2000, but macOS, NetBSD, Haiku and others
all do this. Even OS/2, at least versions 2.11 and 3.0 (both 16 and 32-bit
TCP/IP stacks).

I can't think of a good reason to keep this now, but I'll leave that decision
to people with more experience with obscure use cases. Perhaps hide it behind a
compile-time option, default off?

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