replace remove_reference_t with remove_reference::type

Debug/DebTime.hh

@@ -16,7 +16,7 @@ namespace Debug {
 template <typename DivisorT = int>
 class StopWatchSessionT
 {
-  static constexpr std::remove_reference_t<DivisorT> ONE = 1;
+  static constexpr typename std::remove_reference<DivisorT>::type ONE = 1;
 
 public:
   StopWatchSessionT(Enter& _deb, const char* _sssn_name = nullptr,