Speller check routine missing

Here is the error message:

```
Running speller tests
--
make: *** No rule to make target 'check'.  Stop.
Speller tests failed with exit code 2
🚨 Error: The command exited with status 2
user command error: exit status 2
```

It thus seems the error is not in the speller but in the test setup. @flammie ?