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

https://github.com/lonwillett/void-packages rng-tools-new-jitterentropy-fix
https://github.com/void-linux/void-packages/pull/26933

rng-tools: fix configure to work with new jitterentropy library.
The recent update to the jitterentropy library broke rng-tools
configure. This patch fixes it. The source is the upstream commit:
https://github.com/nhorman/rng-tools/commit/daff4e2dd9d3abb74829f41e72607681163bd309.

A patch file from https://github.com/void-linux/void-packages/pull/26933.patch is attached