fix: use correct fields for ctime and mtime on AIX

[ecnelises]

On AIX, ctime and mtime are structs containing seconds and nanoseconds.

Reference: https://github.com/rust-lang/libc/blob/f05d6a35b25288b143241ebb6b4b071618945431/src/unix/aix/powerpc64.rs#L63

[Byron]

Thanks a lot!

When looking at these seemingly arbitrarily renamed field names over three operating systems, I feel like they are a cruel joke introduced for the sake of incompatibility 😅.

[ecnelises]

Thanks. Maybe we can reuse code from rustix or std? I remember there's similar code.

[Byron]

It would certainly be wonderful to be able to 'inherit' all the compatibility layers they must have put in already. Right now each time there is a change here, there is also a risk to break another platform, of which none is currently tested in CI.

Maybe that could be an additional approach - know the platforms to support and try to build gix on them.