Make futures::task::noop_waker_ref available without std.
          #2505
        
          
      
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#2332 removed the
stddependency and some#[cfg(feature = "std")], but missed the one on the reexport fromfutures_util. This PR removes that cfg attribute, sonoop_waker_refshould be equally available from all places it is reexported. I searched for other mentions ofnoop_waker_refin this repository and did not find any other changes needed.