HW address w/o connection in iphlpapi

[most at museresearch.com]

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

Right. if_nameindex does not return eth0 if I boot up without an ethernet
connection. Maybe this is a system dependent thing? I am running on a RH8
based system.

The if_nameindex code looked a little nicer, but a loop on
if_indextoname() is  not so bad.

- mo