Compat gcc 4.8

[fargies]

This goes with biojppm/cmake#5

• gcc-4.8.hpp is now part of cmake repository.
• relevant include dir is added by c4Project.cmake when needed
• file is installed to not require any compiler-options once deployed
• amalgamate will also embed the file

Note: I'll override last commit once this is validated by @biojppm and cmake project has been merged

[codecov]

Codecov Report

Merging #74 (58514bc) into master (9fd3d37) will increase coverage by 0.14%.
The diff coverage is n/a.

❗ Current head 58514bc differs from pull request most recent head cbdd1b8. Consider uploading reports for the commit cbdd1b8 to get more accurate results

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   93.96%   94.10%   +0.14%     
==========================================
  Files          53       53              
  Lines       11449    11403      -46     
==========================================
- Hits        10758    10731      -27     
+ Misses        691      672      -19     

Impacted Files	Coverage Δ
src/c4/ext/fast_float_all.h	26.81% <0.00%> (-1.31%)	⬇️
src/c4/charconv.hpp	97.25% <0.00%> (-0.04%)	⬇️
test/test_memory_resource.cpp	100.00% <0.00%> (ø)

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[fargies]

@biojppm this one should be ready now

[biojppm]

Thanks!