SDL2 2.28.3-2

[Takashi Yano]

The following packages have been uploaded to the Cygwin distribution:

* libSDL2_2.0_0-2.28.3-2
* libSDL2-devel-2.28.3-2

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.

- There were two problems in SDL2-config.cmake of 2.28.3-1. One is
  using WIN32 despite it had been deleted from cmake package. The
  other is the file name of SDL2 dll was incorrect. This release
  fixes them.