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

build-helper/qmake: fix {C,CXX,LD}FLAGS
https://github.com/void-linux/void-packages/pull/30085

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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- recoll will be submitted in #30086, together with libxslt
- PyQt5 will be updated soon.
- gmic build is broken, even with latest version, with or without this change.