Rename Posix → Unix

[RalfJung]

In Miri, we use the term "POSIX" to refer to the functionality shared between Linux and macOS (and soon, Android: #2011). I used that term because those files started essentially as an implementation of a small part of the POSIX API.

However, in the Rust standard library, the term used for grouping those platforms is "Unix", and there also is target_family = "unix". So I think it would make to rename "posix" to "unix" in the Miri codebase. This should be an easy change. However, it should wait until #2011 lands to reduce merge conflicts.

[b-ncMN]

I am willing to do this, I'll make a draft PR that can be merged after #2011 landed

[b-ncMN]

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[RalfJung]

No rustbot in this repo, but we can track this by hand. :) Thanks for chiming in!

#2011 is still a draft; @landaire know best whether it makes sense to wait for that or whether we can go ahead and let them deal with the merge conflicts as they arise.

[landaire]

I apologize for the delay on #2011. I've been busier than expected recently... I can deal with merge conflicts as they come.

[b-ncMN]

I apologize for the delay on #2011. I've been busier than expected recently... I can deal with merge conflicts as they come.

No worries 😉