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

https://github.com/skmpz/void-packages optipng-0.7.8
https://github.com/void-linux/void-packages/pull/50539

optipng: update to 0.7.8.
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/50539.patch is attached