Move M302 to cpp

Marlin/src/Marlin.cpp

   return false;
 }
 
-#if ENABLED(PREVENT_COLD_EXTRUSION)
-  #include "gcode/config/M302.h"
-#endif
-
 #if ENABLED(MORGAN_SCARA)
   #include "gcode/scara/M360-M364.h"
 #endif

Marlin/src/gcode/config/M302.h → Marlin/src/gcode/config/M302.cpp

  *
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(PREVENT_COLD_EXTRUSION)
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
 /**
  * M302: Allow cold extrudes, or set the minimum extrude temperature
  *
  *       M302 S170    ; only allow extrusion above 170
  *       M302 S170 P1 ; set min extrude temp to 170 but leave disabled
  */
-void gcode_M302() {
+void GcodeSuite::M302() {
   const bool seen_S = parser.seen('S');
   if (seen_S) {
     thermalManager.extrude_min_temp = parser.value_celsius();
     SERIAL_ECHOLNPGM("C)");
   }
 }
+
+#endif // PREVENT_COLD_EXTRUSION

Marlin/src/gcode/gcode.cpp

 extern void gcode_M163();
 extern void gcode_M164();
 extern void gcode_M165();
-extern void gcode_M302();
 extern void gcode_M350();
 extern void gcode_M351();
 extern void gcode_M355();
       #endif
 
       #if ENABLED(PREVENT_COLD_EXTRUSION)
-        case 302: // M302: Allow cold extrudes (set the minimum extrude temperature)
-          gcode_M302();
-          break;
-      #endif // PREVENT_COLD_EXTRUSION
+        case 302: M302(); break;  // M302: Allow cold extrudes (set the minimum extrude temperature)
+      #endif
 
       case 303: // M303: PID autotune
         M303();