Move M240 to cpp

Marlin/src/Marlin.cpp

   return false;
 }
 
-#if defined(CHDK) || HAS_PHOTOGRAPH
-  #include "gcode/feature/camera/M240.h"
-#endif
-
 #if HAS_LCD_CONTRAST
   #include "gcode/lcd/M250.h"
 #endif

Marlin/src/gcode/feature/camera/M240.h → Marlin/src/gcode/feature/camera/M240.cpp

  *
  */
 
+#include "../../../inc/MarlinConfig.h"
+
+#if defined(CHDK) || HAS_PHOTOGRAPH
+
+#include "../../gcode.h"
+
 /**
  * M240: Trigger a camera by emulating a Canon RC-1
  *       See http://www.doc-diy.net/photo/rc-1_hacked/
  */
-void gcode_M240() {
+void GcodeSuite::M240() {
   #ifdef CHDK
 
     OUT_WRITE(CHDK, HIGH);
 
   #endif
 }
+
+#endif // CHDK || HAS_PHOTOGRAPH

Marlin/src/gcode/gcode.cpp

 extern void gcode_M163();
 extern void gcode_M164();
 extern void gcode_M165();
-extern void gcode_M240();
 extern void gcode_M250();
 extern void gcode_M302();
 extern void gcode_M350();
       #endif
 
       #if defined(CHDK) || HAS_PHOTOGRAPH
-        case 240: // M240: Trigger a camera by emulating a Canon RC-1 : http://www.doc-diy.net/photo/rc-1_hacked/
-          gcode_M240();
-          break;
-      #endif // CHDK || PHOTOGRAPH_PIN
+        case 240: M240(); break;  // M240: Trigger a camera by emulating a Canon RC-1 : http://www.doc-diy.net/photo/rc-1_hacked/
+      #endif
 
       #if HAS_LCD_CONTRAST
         case 250: // M250: Set LCD contrast