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

linux-firmware: use included Makefile.
https://github.com/void-linux/void-packages/pull/27817

Description:
Manually copying the files is error prone, leading to a lot of missing
symlinks (defined in the WHENCE file) as well as unnecessary content,
such as source code and some helper scripts. This commit fixes that.

Fixes #27682