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

https://github.com/ndowens/void-packages owncloudcustom
https://github.com/void-linux/void-packages/pull/16119

owncloudclient: add service
Added service, as one can sync folder without the need of GUI
Adopt; contacted maintainer and he said I could take

A patch file from https://github.com/void-linux/void-packages/pull/16119.patch is attached