try to run 7.1 ifconfig on 8.0. without COMPAT_70 in the kernel, it won't run.
Its non-compatibility is probably buried deep within a switch statement for a 
generic function.

The only way we can reasonably make it work is:
- lie about what compat is, and build it inot the kernel, which also hurts 
people who want to remove it because they are using weak archs
- make networking modular?
- kernel hot patching (runtime cost)

We can drop the pretense. it doesn't work.

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