TrigPSC: Suppress thread-safety checker warning.
An uncoming change to the thread-safety checker will generate warnings for virtual calls to unsafe functions.
This then gets a warning for the call to ITrigEventLoopMgr::prepareForRun in Psc::prepareForRun. Perhaps that latter function should also be marked NOT_THREAD_SAFE, but that's awkward since the base class defining this interface is in hltinterface.
Just suppress the warning for now.