🐛 Fix compile with PREVENT_COLD_EXTRUSION off

Marlin/src/lcd/extui/dgus/mks/DGUSDisplayDef.cpp

   VPHELPER(VP_X_PARK_POS, &mks_park_pos.x, ScreenHandler.GetParkPos_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
   VPHELPER(VP_Y_PARK_POS, &mks_park_pos.y, ScreenHandler.GetParkPos_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
   VPHELPER(VP_Z_PARK_POS, &mks_park_pos.z, ScreenHandler.GetParkPos_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
-  VPHELPER(VP_MIN_EX_T, &thermalManager.extrude_min_temp, ScreenHandler.HandleGetExMinTemp_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
+
+  #if ENABLED(PREVENT_COLD_EXTRUSION)
+    VPHELPER(VP_MIN_EX_T, &thermalManager.extrude_min_temp, ScreenHandler.HandleGetExMinTemp_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
+  #endif
 
   #if ENABLED(SENSORLESS_HOMING)  // TMC SENSORLESS Setting
     #if AXIS_HAS_STEALTHCHOP(X)
   VPHELPER(VP_ZOffset_Distance,nullptr ,ScreenHandler.GetZoffsetDistance, nullptr),
   VPHELPER(VP_MESH_LEVEL_ADJUST, nullptr, ScreenHandler.MeshLevelDistanceConfig, nullptr),
   VPHELPER(VP_MESH_LEVEL_POINT,nullptr, ScreenHandler.MeshLevel,nullptr),
-  VPHELPER(VP_Min_EX_T_E, &thermalManager.extrude_min_temp, &ScreenHandler.GetMinExtrudeTemp, &ScreenHandler.DGUSLCD_SendWordValueToDisplay),
+
+  #if ENABLED(PREVENT_COLD_EXTRUSION)
+    VPHELPER(VP_Min_EX_T_E, &thermalManager.extrude_min_temp, &ScreenHandler.GetMinExtrudeTemp, &ScreenHandler.DGUSLCD_SendWordValueToDisplay),
+  #endif
+
   VPHELPER(VP_AutoTurnOffSw, nullptr, &ScreenHandler.GetTurnOffCtrl, nullptr),
 
   #if HOTENDS >= 1

Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp

 void DGUSScreenHandler::GetMinExtrudeTemp(DGUS_VP_Variable &var, void *val_ptr) {
   DEBUG_ECHOLNPGM("GetMinExtrudeTemp");
   const uint16_t value = swap16(*(uint16_t *)val_ptr);
-  thermalManager.extrude_min_temp = value;
+  TERN_(PREVENT_COLD_EXTRUSION, thermalManager.extrude_min_temp = value);
   mks_min_extrusion_temp = value;
   settings.save();
 }
   skipVP = var.VP; // don't overwrite value the next update time as the display might autoincrement in parallel
 }
 
-void DGUSScreenHandler::HandleGetExMinTemp_MKS(DGUS_VP_Variable &var, void *val_ptr) {
-  const uint16_t value_ex_min_temp = swap16(*(uint16_t*)val_ptr);
-  thermalManager.extrude_min_temp = value_ex_min_temp;
-  skipVP = var.VP; // don't overwrite value the next update time as the display might autoincrement in parallel
-}
+#if ENABLED(PREVENT_COLD_EXTRUSION)
+  void DGUSScreenHandler::HandleGetExMinTemp_MKS(DGUS_VP_Variable &var, void *val_ptr) {
+    const uint16_t value_ex_min_temp = swap16(*(uint16_t*)val_ptr);
+    thermalManager.extrude_min_temp = value_ex_min_temp;
+    skipVP = var.VP; // don't overwrite value the next update time as the display might autoincrement in parallel
+  }
+#endif
 
 #if HAS_PID_HEATING
   void DGUSScreenHandler::HandleTemperaturePIDChanged(DGUS_VP_Variable &var, void *val_ptr) {
       break;
   }
 
-  #if HAS_HOTEND
+  #if BOTH(HAS_HOTEND, PREVENT_COLD_EXTRUSION)
     if (hotend_too_cold) {
       if (thermalManager.targetTooColdToExtrude(hotend_too_cold - 1)) thermalManager.setTargetHotend(thermalManager.extrude_min_temp, hotend_too_cold - 1);
       sendinfoscreen(PSTR("NOTICE"), nullptr, PSTR("Please wait."), PSTR("Nozzle heating!"), true, true, true, true);
         #endif
       #endif
 
-      if (mks_min_extrusion_temp != 0)
-        thermalManager.extrude_min_temp = mks_min_extrusion_temp;
+      #if ENABLED(PREVENT_COLD_EXTRUSION)
+        if (mks_min_extrusion_temp != 0)
+          thermalManager.extrude_min_temp = mks_min_extrusion_temp;
+      #endif
 
       DGUS_ExtrudeLoadInit();
 

Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.h

   static void GetZoffsetDistance(DGUS_VP_Variable &var, void *val_ptr);
   static void GetMinExtrudeTemp(DGUS_VP_Variable &var, void *val_ptr);
   static void GetParkPos_MKS(DGUS_VP_Variable &var, void *val_ptr);
-  static void HandleGetExMinTemp_MKS(DGUS_VP_Variable &var, void *val_ptr);
+  #if ENABLED(PREVENT_COLD_EXTRUSION)
+    static void HandleGetExMinTemp_MKS(DGUS_VP_Variable &var, void *val_ptr);
+  #endif
   static void DGUS_LanguageDisplay(uint8_t var);
   static void TMC_ChangeConfig(DGUS_VP_Variable &var, void *val_ptr);
   static void GetTurnOffCtrl(DGUS_VP_Variable &var, void *val_ptr);