Code at the bottom of the CKKWL common JO fragment attempted to use
acmake to obtain the Pythia8 native version, but didn't work. The result was that it always applied a manual acceptance correction, although that was only required for versions < 8.219. This caused significantly wrong cross-sections to be written into the ATLAS metadata.
We don't need the workaround any more and I can't see that we'll ever need it in the releases built from git. At the moment I've commented it out with an explanation, but maybe better that I clean up properly by deleting it.
@ewelina It would be good if we can get this disabling in place before making the currently requested release with Py 8.3.