Remove extraneous if condition

hsbadr · hsbadr · commit e8fa77700c00 · 2021-03-26T15:06:38.000-04:00
diff --git a/stan/math/prim/core/init_threadpool_tbb.hpp b/stan/math/prim/core/init_threadpool_tbb.hpp
@@ -9,11 +9,9 @@
 #include <tbb/tbb_stddef.h>
 
 #if TBB_VERSION_MAJOR >= 2020
-#ifndef TBB_INTERFACE_NEW
 #define TBB_INTERFACE_NEW
 #endif
 #endif
-#endif
 
 #ifdef TBB_INTERFACE_NEW
 #include <tbb/global_control.h>
