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And add another one for the Arcade Mini

This required a bit more trickery.
Also make sure to cleanly exit main.

BK emulator draws to a 32-bits screen surface, making it a bit tricky.
For now, we'll just use DisplayFormat and SDL_SoftStretch.

I'll add more resolutions later.

Again, this should at least make most games playable.
(and this includes going inside of Andos, CSIDOS and MKDOS and starting the executable)

Not a proper fix though but it works.

Should make it easier to play games at least.

(It also no longer requires mmap support)