There is a minor functional change: IPV6_FREEBIND is set of IPv6 sockets, not IP_FREEBIND. This was missed inaf8b1384, but I noticed only after the merging the two functions. And a not-so-minor functional chagnge:7216a3b5dcchanged manager_dns_stub_tcp_fd_extra() to return the fd even if the source was already initialized, but it didn't do the same change for manager_dns_stub_udp_fd_extra(), so it would return 0 in that case. But0354029bf5uses manager_dns_stub_udp_fd_extra() when preparing to call manager_send(), and will pass 0 as the fd in that case. For both socket types fd is now always returned.
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