Add BennuGD_libretro

[diekleinekuh]

This adds an experimental package for running games made with https://www.bennugd.org/ with my libretro core. I tested building from source on my Raspberry PI 3b with retropie 4.8.

The most prominent game this runs is Streets of Rage Remake but others work too.

[Exarkuniv]

@diekleinekuh
if you are ok with this, i would like to add this to https://github.com/Exarkuniv/RetroPie-Extra
until its added to the main RetroPie

[diekleinekuh]

@diekleinekuh if you are ok with this, i would like to add this to https://github.com/Exarkuniv/RetroPie-Extra until its added to the main RetroPie
@Exarkuniv Sure. No objections. If that speeds up making it accessible by others I'm all for it.

[joolswills]

Thank you. Will test asap.