The file docs/internals/s390-opcodes.csv is missing in the distribution tarball. It is referred to in README.s390 and therefore should be shipped. The test none/tests/s390x/op00 still fails. Patch available here: https://bugs.kde.org/show_bug.cgi?id=493959
Pushed commit 54c0a49bca6570a09a0764ccd6cf60f9a08ad493, which should add the missing file s390-opcodes.csv to the distribution tarball.