Update Herwig7HepMC.cxx to define legacy preprocessor directiv
Should fix https://its.cern.ch/jira/browse/AGENE-2091
Tag @ewelina @cgutscho @jchapman
Best regards,
Andrii
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Should fix https://its.cern.ch/jira/browse/AGENE-2091
Tag @ewelina @cgutscho @jchapman
Best regards,
Andrii