Only include editor/SCsub when building the editor: tools=yes

SConstruct

@@ -788,7 +788,8 @@ if selected_platform in platform_list:
     SConscript("core/SCsub")
     SConscript("servers/SCsub")
     SConscript("scene/SCsub")
-    SConscript("editor/SCsub")
+    if env["tools"]:
+        SConscript("editor/SCsub")
     SConscript("drivers/SCsub")
 
     SConscript("platform/SCsub")