HW address w/o connection in iphlpapi

[Juan Lang]

> Yikes! It turns out if_nameindex() doesn't return info for down devices,
> but if_indextoname() does. It's all so touchy... So, attached is an
> alternate patch using if_indextoname() that does work; my last one
> doesn't.

Really?  It works for me.  You mean boot with no link, or what?  I did
that, and if_nameindex still returned eth0.

--Juan

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