Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

 source/src/joystick/dummy/SDL_sysjoystick.c

@@ -1,6 +1,6 @@
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
@@ -58,6 +58,11 @@
    return -1;
}

static void
DUMMY_JoystickSetDevicePlayerIndex(int device_index, int player_index)
{
}

static SDL_JoystickGUID
DUMMY_JoystickGetDeviceGUID(int device_index)
{
@@ -79,7 +84,7 @@
}

static int
DUMMY_JoystickRumble(SDL_Joystick * joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms)
DUMMY_JoystickRumble(SDL_Joystick * joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
    return SDL_Unsupported();
}
@@ -106,6 +111,7 @@
    DUMMY_JoystickDetect,
    DUMMY_JoystickGetDeviceName,
    DUMMY_JoystickGetDevicePlayerIndex,
    DUMMY_JoystickSetDevicePlayerIndex,
    DUMMY_JoystickGetDeviceGUID,
    DUMMY_JoystickGetDeviceInstanceID,
    DUMMY_JoystickOpen,