display: Remove some unused variables

panda/src/glstuff/glGraphicsStateGuardian_src.h

@@ -1161,8 +1161,6 @@ public:
     pvector<std::pair<GLuint, int> > _queries;
     pvector<GLint64> _latency_refs;
   };
-  GLint64 _gpu_reference_time = 0;
-  double _cpu_reference_time;
   pdeque<FrameTiming> _frame_timings;
   FrameTiming *_current_frame_timing = nullptr;
 #endif

panda/src/windisplay/winGraphicsWindow.h

@@ -170,7 +170,6 @@ private:
   bool _ime_open;
   bool _ime_active;
   bool _tracking_mouse_leaving;
-  bool _bCursor_in_WindowClientArea;
   HANDLE _input_device_handle[32];
   HCURSOR _cursor;
   DEVMODE _fullscreen_display_mode;