Prepare for new GaudiPartProp in Gaudi v38
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.
Edited by Marco Clemencic