Removed unused enumeration and constant from internal header file.

src/joystick/emscripten/SDL_sysjoystick_c.h

@@ -27,30 +27,6 @@
 
 #include <emscripten/html5.h>
 
-typedef enum
-{
-    EMSCRIPTEN_CONTROLLER_BUTTON_INVALID = -1,
-    EMSCRIPTEN_CONTROLLER_BUTTON_A,
-    EMSCRIPTEN_CONTROLLER_BUTTON_B,
-    EMSCRIPTEN_CONTROLLER_BUTTON_X,
-    EMSCRIPTEN_CONTROLLER_BUTTON_Y,
-    EMSCRIPTEN_CONTROLLER_BUTTON_L1,
-    EMSCRIPTEN_CONTROLLER_BUTTON_R1,
-    EMSCRIPTEN_CONTROLLER_BUTTON_L2,
-    EMSCRIPTEN_CONTROLLER_BUTTON_R2,
-    EMSCRIPTEN_CONTROLLER_BUTTON_BACK,
-    EMSCRIPTEN_CONTROLLER_BUTTON_START,
-    EMSCRIPTEN_CONTROLLER_BUTTON_LEFTSTICK,
-    EMSCRIPTEN_CONTROLLER_BUTTON_RIGHTSTICK,
-    EMSCRIPTEN_CONTROLLER_DPAD_UP,
-    EMSCRIPTEN_CONTROLLER_DPAD_DOWN,
-    EMSCRIPTEN_CONTROLLER_DPAD_LEFT,
-    EMSCRIPTEN_CONTROLLER_DPAD_RIGHT,
-    EMSCRIPTEN_CONTROLLER_BUTTON_GUIDE,
-} Emscripten_GameControllerButton;
-
-static int EMSCRIPTEN_MAX_NBUTTONS = 18;
-
 /* A linked list of available joysticks */
 typedef struct SDL_joylist_item
 {