sdl2: Update to version 2.26.5

sdl2: Update to version 2.26.5

- Update from version 2.26.4 to 2.26.5
- Update of rootfile
- Changelog
	2.26.5
	    The minimum deployment target on macOS is now 10.11, due to changes in the
             latest Xcode update
	    Fixed incorrect modifier keys handling on macOS
	    Fixed occasional duplicate controller visible on macOS
	    Fixed handling of third party PS4 controller input reports
	    Added support for the trigger buttons on the Victrix Pro FS for PS5
	    Added mapping for Flydigi Vader 2 with the latest firmware (6.0.4.9)
	    Added mapping for DualSense Edge Wireless Controller on Linux
	    Added mapping for Hori Pokken Tournament DX Pro Pad
	    Improved the speed and quality of audio resampling
	    Fixed crash on Linux if dbus can't be initialized

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