Correct unused parameter warnings in labelling and list algorithms

[robertmaynard]

Starting in CUDA 11.3, nvcc will start to unconditionally warn about unused parameters on functions/methods that are in anonymous namespaces.

This corrects issues found by this warning in label and list algorithms

[codecov]

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@@               Coverage Diff               @@
##             branch-21.08    #8493   +/-   ##
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  Coverage                ?   82.90%           
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  Files                   ?      110           
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  Branches                ?        0           
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  Hits                    ?    14998           
  Misses                  ?     3093           
  Partials                ?        0           

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[robertmaynard]

@gpucibot merge

[robertmaynard]

rerun tests