Fixed compiler warning about comma at end of enum.

include/SDL_joystick.h

@@ -83,7 +83,7 @@ typedef enum
     SDL_JOYSTICK_TYPE_DANCE_PAD,
     SDL_JOYSTICK_TYPE_GUITAR,
     SDL_JOYSTICK_TYPE_DRUM_KIT,
-    SDL_JOYSTICK_TYPE_ARCADE_PAD,
+    SDL_JOYSTICK_TYPE_ARCADE_PAD
 } SDL_JoystickType;
 
 typedef enum