fix testimt

Author: ferdymercury

core/thread/test/CMakeLists.txt

@@ -4,7 +4,10 @@
 # For the licensing terms see $ROOTSYS/LICENSE.
 # For the list of contributors see $ROOTSYS/README/CREDITS.
 
-ROOT_ADD_GTEST(testRWLock testRWLock.cxx LIBRARIES Core Thread Hist TBB::tbb)
+ROOT_ADD_GTEST(testRWLock testRWLock.cxx LIBRARIES Core Thread Hist)
+if(imt)
+  target_link_libraries(testRWLock PRIVATE TBB::tbb)
+endif()
 
 ROOT_ADD_GTEST(testTThreadedObject testTThreadedObject.cxx LIBRARIES Hist)