Hepmc3 nightly fixes 25112020 part 1 (!38566) · Merge requests · atlas / athena · GitLab

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Andrii Verbytskyi requested to merge averbyts/athena:hepmc3_nightly_fixes_25112020_part_1 into master Nov 25, 2020

In this MR:

adding missing AtlasHepMCsearchlib needed for builds with HepMC3