Add IPv6 support to getifaddrs() on Bsd #1436
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This greatly helps for IPv6 endianess convertion
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Tested on x86_64 MacOs OpenBsd FreeBsd and NetBsd. There is extra ioctl calls on the ipv6 bsd path because SIOCGIFCONF doesn't returns the addr flag or the netmask. Luckily all bsd systems share the same values for SIOCGIFAFLAG_IN6 and SIOCGIFNETMASK_IN6.
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Tested on x86_64 MacOs OpenBsd FreeBsd and NetBsd.
There is extra ioctl calls on the ipv6 bsd path
because SIOCGIFCONF doesn't returns the addr flag
or the netmask.
Luckily all bsd systems share the same values for
SIOCGIFAFLAG_IN6 and SIOCGIFNETMASK_IN6.