[Libretro] iOS support

[QcSamuel]

Feature request. See above

currently the retroarch buildbot is not building the tic-80 core for ios there used to be a retroarch 1.9.0 ipa shared on the libretro forum that had it and more cores not available at the time but it's not maintained anymore https://forums.libretro.com/t/ios-tvos-retroarch-1-9-0-cores-emulators-download-cydia-repo/29817

previous issue by jet082 #920

[QcSamuel]

would like to add that i opened the issue here and not on https://github.com/libretro/TIC-80 because it is not possible to do so

[RobLoach]

I've attempted to update the core over at libretro#28 ... Running into a few build errors. If anyone smarter than I would like to have a hack at it, I'd be more than happy. Thanks.