Make tor_addr_is_internal_() aware of RFC 6598 (Carrier Grade NAT/Large Scale NAT) IPv4 Ranges

With the IPv4 depletion, many ISPs, cell carriers and cloud providers are deploying Carrier Grade NAT with the subnet defined in RFC 6598 (100.64.0.0/10). We should make Tor aware of this range as it is internal as well.

I will write a patch and give a link to a GitHub PR.

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