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

https://github.com/lonwillett/void-packages acpi_call-fix
https://github.com/void-linux/void-packages/pull/20489

acpi_call-dkms: fix to compile with kernel 5.6


A patch file from https://github.com/void-linux/void-packages/pull/20489.patch is attached