There's a merged pull request on the void-packages repository

rxvt-unicode: fix for tmux-3.4
https://github.com/void-linux/void-packages/pull/48809

Description:
@leahneukirchen 

closes #48807 

#### Testing the changes
- I tested the changes in this PR: **briefly**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64-musl x
  - armv7l x
  - armv6l-musl x