Comment 5 for bug 1979121

@Christian, we uploaded https://launchpad.net/ubuntu/+source/webp-pixbuf-loader/0.0.5-2ubuntu1 now which fixes the recommended TODO

It includes a cherry pick from an upstream fix for the big endian issue, the update built on s390x now

The update includes the autopkgtest that Nathan worked on following your suggestion, one is running the upstream testsuite and the other one converting to a png and comparing the file to the expected output