message: Add errno_location shim for MacOS
diff: @@ -418,7 +418,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  }
  }
  - "__errno_location" => {
  + "__errno_location" | "__error" => {
  let errno_scalar: Scalar<Tag> = this.machine.last_error.unwrap().into();
  this.write_scalar(errno_scalar, dest)?;
  }
  