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

https://github.com/Johnnynator/void-packages qt5.13.1
https://github.com/void-linux/void-packages/pull/14701

[WIP] qt5: update to 5.13.1.
@q66

Testing repo: https://void.johnnynator.dev/qt-5.13.1/

A patch file from https://github.com/void-linux/void-packages/pull/14701.patch is attached