#1955: Suppress spurious warning about method declared but not used

[PhilMiller]

Fixes #1955

[github-actions]

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PR tests (gcc-5, ubuntu, mpich)

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PR tests (clang-10, ubuntu, mpich)

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[codecov]

Codecov Report

Merging #1956 (06a69b4) into develop (5387ede) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1956      +/-   ##
===========================================
- Coverage    84.08%   84.00%   -0.08%     
===========================================
  Files          726      726              
  Lines        25548    25548              
===========================================
- Hits         21482    21462      -20     
- Misses        4066     4086      +20     

Impacted Files	Coverage Δ
tests/unit/lb/test_lb_data_comm.cc	100.00% <ø> (ø)
src/vt/messaging/request_holder.h	69.23% <0.00%> (-7.70%)	⬇️
src/vt/topos/location/location.impl.h	88.19% <0.00%> (-5.91%)	⬇️
src/vt/phase/phase_manager.cc	91.21% <0.00%> (-1.36%)	⬇️