testing/mednaffe: upgrade to 0.9.2
https://github.com/AmatCoder/mednaffe/releases/tag/0.9.2
Added support for gamepad navigation through game list.
Fix Gen/MD 6-buttons controller input mapping.
[Windows] Fix issues when non-ASCII characters are used in paths.
[Windows] Add an option to allow larger fonts for game list.
[Windows] Add dark variants for themes.
[Windows] Fix failure to find configuration inside bin/ or lib/ folders (patch by mayawarrier).
[Linux] Fix joystick support on 32 bits (patch by not-a-user).
[Linux] Flatpak is available on Flathub (thanks to GabMus and hfiguiere for the help).