Support oneTBB

With the changes in this MR I have been able to run successfully the avalanche scheduler tests that were failing in !1470 (closed) with an older version of TBB (2020.3) and a newer one (oneTBB, 2021.10 which is not from 2021 but was released a few months ago). I also checked that changing the number of threads passed to the AvalancheSchedulerSvc is indeed in effect since it was related to one of the changes when initializing task_arena.

Fixes #270 (closed)

Supersedes !1470 (closed)

GaudiHive/src/AvalancheSchedulerSvc.cpp

@@ -34,8 +34,6 @@
 #include "boost/algorithm/string.hpp"
 #include "boost/thread.hpp"
 #include "boost/tokenizer.hpp"
-// DP waiting for the TBB service
-#include "tbb/tbb_stddef.h"
 
 // Instantiation of a static factory class used by clients to create instances of this service
 DECLARE_COMPONENT( AvalancheSchedulerSvc )