Ignore new clang warning from Boost.MP

[mborland]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.3%. Comparing base (9c436f3) to head (d8e1c43).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1409     +/-   ##
=========================================
+ Coverage     98.3%   98.3%   +0.1%     
=========================================
  Files          291     291             
  Lines        23674   23674             
  Branches      2070    2070             
=========================================
+ Hits         23249   23250      +1     
+ Misses         425     424      -1     

Files with missing lines	Coverage Δ
test/test_cbrt_from_math.cpp	100.0% <ø> (ø)

... and 1 file with indirect coverage changes

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