Add IPv6 support.
(Qipv4, Qipv6): New vars. (syms_of_process): Intern and staticpro them. (Fformat_network_address): Handle 9 or 8 element vector as IPv6 address with or without port number. Handle 4 element vector as IPv4 address without port number. (conv_sockaddr_to_lisp, get_lisp_to_sockaddr_size) (conv_lisp_to_sockaddr): Handle IPv6 addresses. (Fmake_network_process): Use :family 'ipv4 and 'ipv6 to explicitly request that address family only. :family nil or omitted means to determine address family from the specified :host and :service. (server_accept_connection): Handle IPv6 addresses. (init_process): Add (:family ipv4) and (:family ipv6) sub-features. (ifflag_table): Add missing OpenBSD IFF_ flags.
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