Allow compiling on tvOS, watchOS and visionOS too

[madsmtm]

Assuming that the mach2 crate is updated to support these platforms, or we get rid of that dependency.

I haven't tested this, only did the (very few) necessary changes to make it compile. But I strongly suspect it'll work if it works on iOS.

[sirhcel]

Thank for for creating this PR @madsmtm!

Assuming that the mach2 crate is updated to support these platforms, or we get rid of that dependency.

Am reading it right, that you are aiming at a future point in time when support for tvOS, watchOS, and visionOS might get into the mach2 crate? Do you know if there is already some work in this direction going on?

What do you mean with 'getting rid of that dependency'?

[madsmtm]

Do you know if there is already some work in this direction going on?

Unfortunately no, mach2 seems unmaintained, and I don't know of a maintained alternative.

What do you mean with 'getting rid of that dependency'?

The use of mach2 in this crate is very minimal, basically two consts KERN_SUCCESS and MACH_PORT_NULL and a typedef mach_port_t = c_uint. So it'd be quite easy to get rid of entirely.

FYI, I'm somewhat planning to migrate this crate to objc2, see my very in draft branch, I might do it as part of that.

[madsmtm]

Btw, I opened a PR to mach2 to support tvOS, watchOS and visionOS: JohnTitor/mach2#50