There is an updated pull request by mobinmob against master on the void-packages repository

https://github.com/mobinmob/void-packages icewm
https://github.com/void-linux/void-packages/pull/29998

icewm: update to 2.3.1.
CMAKE_GENERATOR and make_cmd are adjusted to create and use a makefile and make.

```
Linting srcpkgs/icewm/template...
srcpkgs/icewm/template:25: custom variables should use _ prefix: CMAKE_GENERATOR="Unix Makefiles"
```
`xlint` is wrong here.

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#### 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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A patch file from https://github.com/void-linux/void-packages/pull/29998.patch is attached