Port of PPSSPP to the OpenPandora

[xsacha]

I merged most of the native changes. VSync was commented out so I left that out. Was that intended?

I think we discussed Alpha Hack on github Issues before and Henrik thought there was a better way of doing it?

Which functions are conflicting? I don't understand 'Rx' (do you mean R0, R1, ..?) . If there's something we can rename or namespace, it will be much nicer than that hack redefining the function.

I think frameskip of 3 is enough. Games are very jerky if it runs at 3! Not sure if the Pandora CPU can handle generating up to 6, but if it can the games probably wouldn't be playable.