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

https://github.com/Chocimier/void-packages-org update-check-fetch-once
https://github.com/void-linux/void-packages/pull/6395

update-check: download each url once
Speed up for packages with multiple downloads from same location or having homepage and distfiles at gitlab or github.

A patch file from https://github.com/void-linux/void-packages/pull/6395.patch is attached