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

memtest86+: fix musl build
https://github.com/void-linux/void-packages/pull/29562

Description:
<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [x] I generally don't use the affected packages but briefly tested this PR

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#### Does it build and run successfully? 
(Please choose at least one native build and, if supported, at least one cross build. More are better.)
- [x] I built this PR locally for my native architecture, x86_64-musl
- [x] I built this PR locally for these architectures:
  - [x] i686
  - [x] i686-musl
  - [x] x86_64