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

https://github.com/kruceter/void-packages memcached
https://github.com/void-linux/void-packages/pull/41936

memcached: update to 1.6.18.
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/41936.patch is attached