as weber notes in Bug 99:

if_nameindex doesnt list all of my interfaces!

this is because we are still using the old style ioctl(SIOCGIFINDEX) for
gathering interface names/indexes.  while this code is pretty small, the
kernel does not return all interfaces via this method.  so we import the
new style netlink code from glibc and make it optional so those people
who need the full functionality can get it.

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