Try fallback on IPv4 ANYADDR when IPv6 ANYADDR fails
https://bugs.php.net/bug.php?id=74166
A host system with no/limited IPv6 support will fail at binding
the IPv6 ANYADDR address (::) as the address family is unsupported.
Deal with this by handling failure to implicitly bind to ::
as a soft failure, falling back to 0.0.0.0.
If binding to :: failed for some other reason (e.g. port in use)
then binding to 0.0.0.0 will likely fail as well, but we'll
get appropriate warnings for that.
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