New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/issues/28424#issuecomment-772244074

Comment:
They seem to have removed it.

It's the same link that http://x265.org/v3-4-is-released/ has

There is this repo https://bitbucket.org/multicoreware/x265_git/src/master/ but it doesn't contain a 3.4 release. You will have to use our distfile cache for now.