Add keys for SDL 2.0.14's new gamepad buttons

This fixes the additional buttons triggering binds for ioq3 left
and right joystick direction keys.

code/sdl/sdl_input.c

@@ -657,7 +657,14 @@ static void IN_GamepadMove( void )
 		qboolean pressed = SDL_GameControllerGetButton(gamepad, SDL_CONTROLLER_BUTTON_A + i);
 		if (pressed != stick_state.buttons[i])
 		{
-			Com_QueueEvent(in_eventTime, SE_KEY, K_PAD0_A + i, pressed, 0, NULL);
+#if SDL_VERSION_ATLEAST( 2, 0, 14 )
+			if ( i >= SDL_CONTROLLER_BUTTON_MISC1 ) {
+				Com_QueueEvent(in_eventTime, SE_KEY, K_PAD0_MISC1 + i - SDL_CONTROLLER_BUTTON_MISC1, pressed, 0, NULL);
+			} else
+#endif
+			{
+				Com_QueueEvent(in_eventTime, SE_KEY, K_PAD0_A + i, pressed, 0, NULL);
+			}
 			stick_state.buttons[i] = pressed;
 		}
 	}