[cmake] fixes tbb debug mode linking

cmake/modules/DuneStuffMacros.cmake

@@ -146,7 +146,7 @@ include(FindTBB)
 find_package(TBB)
 if(TBB_FOUND)
   if(CMAKE_BUILD_TYPE MATCHES DEBUG)
-    list(APPEND DUNE_DEFAULT_LIBS "${TBB_DEBUG_LIBRARIES}")
+    list(APPEND DUNE_DEFAULT_LIBS "${TBB_LIBRARIES}" "${TBB_DEBUG_LIBRARIES}")
   elseif(CMAKE_BUILD_TYPE MATCHES DEBUG)
     list(APPEND DUNE_DEFAULT_LIBS "${TBB_LIBRARIES}")
   endif(CMAKE_BUILD_TYPE MATCHES DEBUG)