ENH: clean unused macros in superbuild code

SuperBuild/CMake/External_ossim.cmake

@@ -11,8 +11,6 @@ message(STATUS "Setup Ossim...")
 #  set(DEFAULT_USE_SYSTEM_OSSIM  ON)
 #endif()
 
-ADD_SYSTEM_LOCATION(PROJECT ${proj} VARIABLES ${proj}_LIBRARY ${proj}_INCLUDE_DIR)
-
 if(USE_SYSTEM_OSSIM)
   find_package ( Ossim )
   add_custom_target(${proj})

SuperBuild/CMake/External_tiff.cmake

@@ -5,10 +5,6 @@ set(__EXTERNAL_${proj}__ 1)
 
 message(STATUS "Setup libtiff...")
 
-#ADD_SYSTEM_LOCATION(PROJECT ${proj} VARIABLES ${proj}_LIBRARY ${proj}_INCLUDE_DIR)
-
-#ADD_SYSTEM_PREFIX(PROJECT ${proj})
-
 if(USE_SYSTEM_TIFF)
   find_package ( TIFF )
   add_custom_target(${proj})