message: Add `pthread_attr_get_np` shim
diff: @@ -39,6 +39,13 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  // Return success (`0`).
  this.write_null(dest)?;
  }
  +
  + // Linux's `pthread_getattr_np` equivalent
  + "pthread_attr_get_np" if this.frame_in_std() => {
  + let [_thread, _attr] =
  + this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
  + this.write_null(dest)?;
  + }
  _ => return Ok(EmulateByNameResult::NotSupported),
  }
  Ok(EmulateByNameResult::NeedsJumping)
  