Tor unit tests fail on FreeBSD IPv6-only
``` address/get_if_addrs_ifaddrs: [forking] FAIL src/test/test_address.c:272: assert(smartlist_contains_localhost_tor_addr(results)) [get_if_addrs_ifaddrs FAILED] address/ifaddrs_to_smartlist: OK address/get_if_addrs_ioctl: [forking] Nov 18 09:35:23.398 [err] socket failed: Protocol not supported FAIL src/test/test_address.c:484: assert(result) [get_if_addrs_ioctl FAILED] … util/socket: [forking] FAIL src/test/test_util.c:4360: assert(SOCKET_OK(fd1)) [socket FAILED] util/socketpair: [forking] OK util/socketpair_ersatz: [forking] FAIL src/test/test_util.c:4416: assert(0 OP_EQ tor_socketpair_fn(family, SOCK_STREAM, 0, fds)): 0 vs -43 [socketpair_ersatz FAILED] ```
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