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MuonTrackTruthTool: fix HepMC2 compilation

HepMC2 has no equivalent of HepMC3/PrintStreams.h and HepMC3/Print.h, so have to add back some of the preprocessor checks removed in !60725 (merged).
We are trying to keep the master--HepMC2 nightly going for now to allow performance comparisons with the main HepMC3-based nightlies.
Tagging @averbyts.

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