Fix HepMcParticleLink_test compilation with HepMC2 (ATLASSIM-7101)
Add HepMC2-specific syntax. Should fix ATLASSIM-7101.
Tested locally, but the CI uses HepMC3, so will not see any change in code compiled.
GitLab jobs artifacts no longer stored forever as of Monday, November 4th 08:30h. Further information under https://cern.ch/otg0152576
Add HepMC2-specific syntax. Should fix ATLASSIM-7101.
Tested locally, but the CI uses HepMC3, so will not see any change in code compiled.