New issue by camoz on void-packages repository

https://github.com/void-linux/void-packages/issues/36266

Description:
[btrbk](https://github.com/void-linux/void-packages/blob/master/srcpkgs/btrbk/template) still depends on `pv`, but that dependency was dropped in `btrbk-0.29.0`, see the [ChangeLog](https://github.com/digint/btrbk/blob/master/ChangeLog):

```
  * Dropped run-time dependency on "pv" (in favor of "mbuffer").
```

Like `OpenSSH`, [`mbuffer` is optional](https://github.com/digint/btrbk#prerequisites) btw.