[go-rpm-macros] Issue #53: Allow to pass -t / -d to go_generate_buildrequires to exclude some BR

[Robert-André Mauchin]

eclipseo reported a new issue against the project: `go-rpm-macros` that you are following:
``
Very occasionally I need to bypass some BR to vendor some stuff. It would be neat to be able to pass -t / - d / -r to %go_generate_buildrequires for it to be passed to the golist call:

```
   --ignore-dir value, -d value         Directory to ignore
   --ignore-tree value, -t value        Directory tree to ignore
   --ignore-regex value, -r value       Regex specified files/dirs to ignore
```

``

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https://pagure.io/go-rpm-macros/issue/53