[Bounty $5] Create a PS4 port of Retroarch

This bounty is about creating a Playstation 4 port of Retroarch! To complete the bounty: -Create a PS4 port of Retroarch with at least 5 cores working good -Design the port so that it will be possible (also for other developers) to: add more cores to this port in the future and improve the overall functioning of the port. It would be nice (also if not mandatory) having a GitHub repository for watching work progress.

Link to bountysource: https://www.bountysource.com/issues/80019144-bounty-create-a-ps4-port-of-retroarch

GitHub issue: https://github.com/libretro/RetroArch/issues/9444