Missing IPv6 default route on protocol kernel and table master6

[Bernd Naumann]

I may should have had a look at the log before :/


```
Thu Oct  6 09:32:51 2022 daemon.err bird: KRT: Received route ::/0 with 
strange next-hop fe80::f6cc:55ff:fe42:1a94
```

But why is this a strange a next-hop? Routes with via Link-Local 
next-hop just work fine with OSPF and BGP, whats the issue here?