SuperBuild: use list instead of cmake global property

SuperBuild/CMake/SuperBuild_Macro.cmake

@@ -69,9 +69,9 @@ endmacro(SETUP_SUPERBUILD)
 macro(ADDTO_DEPENDENCIES_IF_NOT_SYSTEM project)
   foreach(dep ${ARGN})
     if(NOT USE_SYSTEM_${dep})
-#      get_property(old_${project}_DEPENDENCIES GLOBAL PROPERTY prop_${project}_DEPENDENCIES)
+      #      get_property(old_${project}_DEPENDENCIES GLOBAL PROPERTY prop_${project}_DEPENDENCIES)
       list(APPEND ${project}_DEPENDENCIES "${dep}")
- #     set_property(GLOBAL PROPERTY prop_${project}_DEPENDENCIES "${old_${project}_DEPENDENCIES}")
+      #     set_property(GLOBAL PROPERTY prop_${project}_DEPENDENCIES "${old_${project}_DEPENDENCIES}")
     endif()
     string(TOLOWER ${dep} dep_lower)
     include(External_${dep_lower})