Add IPv4 fallback support on IPv6 failures #4191
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Not yet supported by .NET itself, so we need to do this ourselves.The case where this can happen is where DNSv6 succeeds, but the actual connection cannot be established. Without this added logic, a fallback to IPv4 (dns and connection) does not occur.
See inline comments for further rationale.
Closes ppy/osu#3507.