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

[WIP] qt5: split every submodule into it's own template
https://github.com/void-linux/void-packages/pull/20893

Description:
This should make it less likely to constantly blow up the build servers. Also make it less annoying when updating and something fails in do_install and everything needs to be cleaned up.

Broken stuff:

- [ ] `qt5-wayland` cross
- [ ] qmake cross as wonky as ever (e.g. `host_build` in `.pro` has no effect, and modules do never get found on target arch). Ironically this whole PR only works because of that :)
- [ ] some deps are not detected when cross building (e.g. libdrm, tries to include from host)