old os2 analogue joystick code ported from SDL-1.2. disabled by default,

build-tested only.

include/SDL_config_os2.h

@@ -32,8 +32,9 @@
 #define SDL_AUDIO_DRIVER_OS2 1
 
 #define SDL_POWER_DISABLED  1
-#define SDL_JOYSTICK_DISABLED 1
 #define SDL_HAPTIC_DISABLED 1
+#define SDL_JOYSTICK_DISABLED 1
+/*#undef SDL_JOYSTICK_OS2 */
 /*#undef SDL_JOYSTICK_HIDAPI */
 /*#undef SDL_JOYSTICK_VIRTUAL */
 
@@ -44,9 +45,6 @@
 /* Enable OpenGL support */
 /* #undef SDL_VIDEO_OPENGL */
 
-/* Enable Vulkan support */
-/* #undef SDL_VIDEO_VULKAN */
-
 #define SDL_THREAD_OS2 1
 #define SDL_LOADSO_OS2 1
 #define SDL_TIMER_OS2 1