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

https://github.com/tornaria/void-packages iperf
https://github.com/void-linux/void-packages/pull/34488

iperf: update to 2.1.5, adopt.
#### Testing the changes
- I tested the changes in this PR: **briefly**

A patch file from https://github.com/void-linux/void-packages/pull/34488.patch is attached