Remove deprecated function

[mborland]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://1046.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.4%. Comparing base (c993480) to head (80d66d2).
⚠️ Report is 15 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1046     +/-   ##
=========================================
+ Coverage     98.3%   98.4%   +0.1%     
=========================================
  Files          249     249             
  Lines        16490   16490             
  Branches      1855    1855             
=========================================
+ Hits         16209   16210      +1     
+ Misses         281     280      -1     

Files with missing lines	Coverage Δ
include/boost/decimal/detail/cmath/rescale.hpp	100.0% <ø> (ø)

... and 1 file with indirect coverage changes

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