Configuring RPKI returns syntax error, unexpected CF_SYM_UNDEFINED

[Brooks Swinnerton]

Hello,

I'm trying to configure RPKI in BIRD 2.0.6. With the following
configuration:

```
200 roa4 table r4;
201 roa6 table r6;
202
203 protocol rpki gortr {
204   roa4 { table r4; };
205   roa6 { table r6; };
206
207   remote "rpki.neptunenetworks.org" port 8282;
208
209   retry keep 90;
210   refresh keep 900;
211   expire keep 172800;
212 }
```

I receive the following when loading the configuration:

```
bird> configure soft
Reading configuration from /etc/bird.conf
/etc/bird.conf:203:10 syntax error, unexpected CF_SYM_UNDEFINED
```
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