handling of the onlink next hop

[Radu CARPA]

Hi team,

We've just got the update of bird 
(bird-2.16.2-1.el9.x86_64->bird-3.1.1-1.el9.x86_64) delivered via rpm 
updates and it broke our configuration with the following error message:

`/etc/bird.conf:7:5 syntax error, unexpected ONLINK`

By reading the migration guide, i see that it was a deliberate choice to 
stop supporting this attribute: "The|onlink|route attribute has been 
temporarily disabled until we find out how to implement it properly."

We used the functionality implemented in 
7144c9ca46f092da33a4e051bbce8f973a3bd8c4 . In particular, with the 
following configuration:

```

     ifname = "tunl0";
     onlink = true;
     gw = from;

```

Is there a plan to bring back support for it in the nearby future?

If not, I will try to get in touch with the maintainer of the package in 
EPEL to see if it's possible to submit and keep maintaining a "bird2" 
branch of this package in EPEL.

Regards,

Radu
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