Laytan

The amd64 CI for MacOS was removed in https://github.com/odin-lang/Odin/commit/4281dc4999397ff8c5ff8d86b20c6a4f02adbb09, it should be added again and the reason for removal should be fixed.

`core:os` tracking issue

16

We are nearing the replacement of `core:os`, this issue outlines todos and nice to haves. Todos: - [x] #3279 - [x] #4712 - [x] @gingerBill needs to look at the...