slideshow: [loplugin:unreffun]

Change-Id: I112e85d999a160b9b6393e924e981231d17f439d

slideshow/source/engine/sp_debug.cxx

@@ -229,14 +229,6 @@ void sp_scalar_destructor_hook(void *, std::size_t, void * pn)
     get_map().erase(pn);
 }
 
-void sp_array_constructor_hook(void *)
-{
-}
-
-void sp_array_destructor_hook(void *)
-{
-}
-
 } // namespace boost
 
 #endif // defined(BOOST_SP_ENABLE_DEBUG_HOOKS)