SDL2 2.28.4-1a (Test)

[Takashi Yano]

The following packages have been uploaded to the Cygwin distribution:

* libSDL2_2.0_0-2.28.4-1a (Test)
* libSDL2-devel-2.28.4-1a (Test)

This is the Simple DirectMedia Layer, a general API that provides
low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL,
and 2D framebuffer across multiple platforms.

- Hopefully, both dinput and xinput work this time.