sdl2: Update to version 2.18.5

sdl2: Update to version 2.18.5

- Update from version 2.28.3 to 2.28.5
- Update of rootfile
- Changelog
    2.28.5
	This is a stable bugfix release, with the following changes:
	    Added support for the HP HyperX Clutch Gladiate controller
	    Fixed a crash if a controller is disconnected while SDL is opening it
	    Fixed a crash on Linux if XInput2 isn't available at runtime
    2.28.4
	This is a stable bugfix release, with the following changes:
	    Enable clipping for zero sized rectangles in the SDL renderer
	    Notify X11 clipboard managers when the clipboard changes
	    Fixed sensor timestamps for third-party PS5 controllers
	    Added detection for Logitech and Simagic racing wheels

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>