Another fix to properly find TBB using RKCOMMON_TBB_ROOT hint

cmake/rkcommon_macros.cmake

@@ -130,6 +130,9 @@ macro(rkcommon_create_tasking_target FROM_INSTALL)
   set(RKCOMMON_TASKING_LIBS ${CMAKE_THREAD_LIBS_INIT})
 
   if(RKCOMMON_TASKING_TBB)
+    if (NOT RKCOMMON_TBB_ROOT STREQUAL "")
+      set(TBB_ROOT ${RKCOMMON_TBB_ROOT})
+    endif()
     if (${FROM_INSTALL})
       find_dependency(TBB)
     else()
@@ -138,9 +141,6 @@ macro(rkcommon_create_tasking_target FROM_INSTALL)
         # CMP0074.
         cmake_policy(SET CMP0074 NEW)
       endif()
-      if (NOT RKCOMMON_TBB_ROOT STREQUAL "")
-        set(TBB_ROOT ${RKCOMMON_TBB_ROOT})
-      endif()
       find_package(TBB 4.4 REQUIRED tbb tbbmalloc)
     endif()