There is a new pull request by pbui against master on the void-packages repository

https://github.com/pbui/void-packages python-PyQt5
https://github.com/void-linux/void-packages/pull/13195

python-PyQt5: fix cross build
This fixes cross building by modifying the explicit library paths to Qt5 shared libraries to include the XBPS_CROSS_BASE.

Tested by cross building armv7l and armv7l-musl.

[ci skip]

A patch file from https://github.com/void-linux/void-packages/pull/13195.patch is attached