Skip extension test as well

Author: Mytherin

test/extension/CMakeLists.txt

@@ -21,10 +21,12 @@ if(NOT WIN32 AND NOT SUN)
     ${PARAMETERS}
     ../extension/loadable_extension_optimizer_demo.cpp)
 
+  if(${ENABLE_UNITTEST_CPP_TESTS})
   set(TEST_EXT_OBJECTS test_remote_optimizer.cpp)
 
   add_library_unity(test_extensions OBJECT ${TEST_EXT_OBJECTS})
   set(ALL_OBJECT_FILES
       ${ALL_OBJECT_FILES} $<TARGET_OBJECTS:test_extensions>
       PARENT_SCOPE)
+  endif()
 endif()