gaudi/Gaudi!1493 (merged) replaces the old GaudiPartProp with a backport of LHCb Kernel/PartProp. This deprecates headers like GaudiKernel/ParticleProperty.h
(which is not really needed in LHCb) and introduces the namespace Gaudi::Decays
that might clash with Decays
in some cases.
This backward compatible MR is to make sure that when we switch to Gaudi v38 everything still works.