This update for sar2 fixes the following issues:

Update to version 2.4.0:

* Improvements to the Joystick system, adding new Rudder+Brakes mode, moving to libSDL2 and cleaning up unused menu settings.
* Fix lagging when aircraft is landed.
* Honor wheel brake coefficient.

This update was imported from the openSUSE:Leap:15.1:Update update project.