Remove overloads no longer required by Math.

[jzmaddock]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.1%. Comparing base (7646f8e) to head (26d1a29).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #623     +/-   ##
=========================================
- Coverage     94.1%   94.1%   -0.0%     
=========================================
  Files          274     274             
  Lines        26766   26766             
=========================================
- Hits         25163   25161      -2     
- Misses        1603    1605      +2     

Files	Coverage Δ
...nclude/boost/multiprecision/detail/default_ops.hpp	90.8% <ø> (ø)

... and 1 file with indirect coverage changes

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