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

https://github.com/classabbyamp/void-packages common/add-xpkgdiff-ci
https://github.com/void-linux/void-packages/pull/36759

add xpkgdiff to CI
- common/travis/xpkgdiff.sh: add script to compare pkgs to previous version
- .github/workflows/build.yaml: add xpkgdiff CI step

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Currently this does not work properly on crossbuilds, but will when leahneukirchen/xtools#236 is merged.

#### Testing the changes
- I tested the changes in this PR: **YES**
  See [log here](https://github.com/void-linux/void-packages/runs/6069631623?check_suite_focus=true#step:9:8)

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A patch file from https://github.com/void-linux/void-packages/pull/36759.patch is attached