Fix for PPC64 errno value converting LDBL_MIN

[mborland]

Closes: #103

[codecov]

Codecov Report

Merging #104 (5b5850f) into develop (ff8712e) will decrease coverage by 0.02%.
The diff coverage is 40.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #104      +/-   ##
===========================================
- Coverage    75.90%   75.89%   -0.02%     
===========================================
  Files           28       28              
  Lines         3955     3957       +2     
===========================================
+ Hits          3002     3003       +1     
- Misses         953      954       +1     

Files	Coverage Δ
src/from_chars.cpp	97.14% <66.66%> (-2.86%)	⬇️
include/boost/charconv/to_chars.hpp	74.47% <0.00%> (ø)

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