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

https://github.com/skmpz/void-packages cava-0.8.1
https://github.com/void-linux/void-packages/pull/36766

cava: update to 0.8.1.
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A patch file from https://github.com/void-linux/void-packages/pull/36766.patch is attached