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

https://github.com/CameronNemo/void-packages lxc
https://github.com/void-linux/void-packages/pull/36784

lxc: update to 4.0.12
Also add update file.

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A patch file from https://github.com/void-linux/void-packages/pull/36784.patch is attached