Migrate to modern TBB version (#6300)

unit_tests/util/static_rtree.cpp

@@ -24,15 +24,6 @@
 #include <utility>
 #include <vector>
 
-// explicit TBB scheduler init to register resources cleanup at exit
-#if TBB_VERSION_MAJOR == 2020
-#include <tbb/global_control.h>
-tbb::global_control scheduler(tbb::global_control::max_allowed_parallelism, 2);
-#else
-#include <tbb/task_scheduler_init.h>
-tbb::task_scheduler_init init(2);
-#endif
-
 BOOST_AUTO_TEST_SUITE(static_rtree)
 
 using namespace osrm;