ci: add macOS universal build

[KhoraLee]

This will add additional build of universal macOS binary which can be run natively on both Apple silicon and Intel-based macOS.
Due to compiling both architecture, CI run time will be increased

TODO:

• Make FFMPEG binaries as universal binary (Build and use universal binary on macOS ffmpeg-core#10)
• Fix ccache on macOS CI (ci: fix bad ccache hit rate on macOS #2858)
  • Reduce macos unversial build's CI time
• Build unicorn library when CI is running not using pre-built universal binary
• Fix Unicorn or disable it
• Properly fix memory issue with page size larger than 4KiB (mem: Improve memory issue when page size is not 4KiB #2843)
• Enable HiDPI (app/gui: support HiDPI on macOS #3248)

[Macdu]

A universal build is a nice idea. However, the longer compile time is kind of an issue. I think the MacOs compiler cache (ccache / scache) in the CI should be fixed before merging this PR.

[Macdu]

Also it would be better not to add prebuilts to the main repo. The best would be to do like for Windows and download the prebuilts only when necessary (about unicorn)

[KhoraLee]

Also it would be better not to add prebuilts to the main repo. The best would be to do like for Windows and download the prebuilts only when necessary (about unicorn)

I'm aware about unicorn. But how about FFMPEG? It is downloading all prebuilts regardless of OS.
Also I saw android version of Vita3K uses Unicorn 2, so if you don't mind could you upstream Unicorn 2 things?

[Macdu]

Also it would be better not to add prebuilts to the main repo. The best would be to do like for Windows and download the prebuilts only when necessary (about unicorn)

I'm aware about unicorn. But how about FFMPEG? It is downloading all prebuilts regardless of OS.
Also I saw android version of Vita3K uses Unicorn 2, so if you don't mind could you upstream Unicorn 2 things?

I was only talking about unicorn here. For ffmpeg I'll need to change later the way prebuilts are downloaded. It is not a concern for this PR.

About unicorn, it is not included in the Android builds as it is GPL. But indeed when I first tried building Vita3K for Android, I was using Unicorn and updated to Unicorn 2 in the process. I'll upstream the changes.

[KhoraLee]

Now it builds unicorn when CI process run. But due to Unicorn 1 bug, Unicorn backend will not work on arm64 macOS machines.

CI run time will be about 20~25 min

[Macdu]

I'll do the PR to update to unicorn2 today or tomorrow.