[BIRD 2.0.x] Netlink: ignore dead routes

[Vincent Bernat]

 ❦ 14 janvier 2021 04:18 +01, Ondrej Zajicek:

> Although it would make sense to handle dead routes as withdraws instead
> of just ingore them (for async notification), it does not matter for sync
> scan, and as i noticed during testing, Linux kernel does not send async
> notifications (when the flag changes to dead) anyways, so it does not
> really matter.

It would makes sense to fix Linux for that. I'll try to send a patch and
ping here again if it gets accepted.
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