Adding back add_subdirectory call ...

... for the Standalone folder

CMakeLists.txt

@@ -43,4 +43,5 @@ else()
     set_property(GLOBAL APPEND PROPERTY LY_PROJECTS_TARGET_NAME ${project_target_name})
 
     add_subdirectory(Gem)
-endif()
+    add_subdirectory(Standalone)
+endif()