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

https://github.com/skmpz/void-packages json-c-0.16
https://github.com/void-linux/void-packages/pull/37603

json-c: update to 0.16, adopt
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A patch file from https://github.com/void-linux/void-packages/pull/37603.patch is attached