There's a merged pull request on the void-packages repository

qalculate: update to 4.8.1, adopt.
https://github.com/void-linux/void-packages/pull/46900

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly**

#### Local build testing
- I built this PR locally for my native architecture, `x86_64-glibc`
- I built this PR locally for these architectures:
  - `x86_64-musl`

[the previous maintainer](https://github.com/ashpool37) has not contributed to void [in two years](https://github.com/void-linux/void-packages/pulls?q=is%3Apr+author%3Aashpool37+), and I actively use this software, so I feel keen on maintaining it for the forseeable future