HW address w/o connection in iphlpapi

[Juan Lang]

> Wait. This works better than getifaddrs. It successfully returns info
> for "down" devices on my RH8 based linux box, with my creaky old
> wine-20050419.
(snip)
> You made comments in the source about if_indextoname having issues. So
> perhaps this patch won't be useful to you. But it works for us, so I'll
> apply it to our wine sources unless/until something better comes along.

Cool, thanks for that.  Like I mention in the comments, if_nameindex has
the disadvantage that it doesn't handle virtual interfaces.  I'll try to
hack this up to use a combination of if_nameindex and SIOCGIFCONF if I
can, but feel free to beat me to it ;)

--Juan

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