set TBB_PREVIEW_GLOBAL_CONTROL for older tbb versions

core/imt/src/RTaskArena.cxx

@@ -6,6 +6,7 @@
 #include <mutex>
 #include <thread>
 #include "tbb/task_arena.h"
+#define TBB_PREVIEW_GLOBAL_CONTROL 1 // required for TBB versions preceding 2019_U4
 #include "tbb/global_control.h"
 
 //////////////////////////////////////////////////////////////////////////

core/imt/src/TThreadExecutor.cxx

@@ -4,6 +4,8 @@
 #pragma GCC diagnostic ignored "-Wshadow"
 #endif
 #include "tbb/tbb.h"
+#define TBB_PREVIEW_GLOBAL_CONTROL 1 // required for TBB versions preceding 2019_U4
+#include "tbb/global_control.h"
 #if !defined(_MSC_VER)
 #pragma GCC diagnostic pop
 #endif