Add missing dist files

[fdelapena]

Towards a proper fix for #1753, workaround for now with the traditional way so far, add guard headers to keep compiler building properly for other ports.

[Ghabry]

Don't think you need extra header guards in the header.
The header is never included so the compiler won't complain about missing symbols.

[mateofio]

Don't think you need extra header guards in the header.
The header is never included so the compiler won't complain about missing symbols.

Is it? If you include 3ds_ui.cpp in the automake sources for example then I think 3ds_ui.h gets included.

[fdelapena]

That cpp file has the include guarded, so it's safe in that particular case.

I saw the guard at audio_psp2.h (also at audio_libretro.h), so it also tried to keep some consistency, but I could drop the commit anyways.

[Ghabry]

I saw the guard at

Hm, you are right, we are just not consistent there. Keep them.

[Ghabry]

oh completely forgot this one, works for me with CMake after make dist 👍