New review comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/33686#discussion_r737711294

Comment:
> `license` A string matching the license's [SPDX Short identifier](https://spdx.org/licenses),
> `Public Domain`, or string prefixed with `custom:` for other licenses.

```suggestion
license="custom:SCOWL"
```