Support __linux__ define to detect linux

[BastianBlokland]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.30%. Comparing base (695e56d) to head (e4b34e3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
+ Coverage   81.28%   81.30%   +0.01%     
==========================================
  Files         299      299              
  Lines       16129    16129              
==========================================
+ Hits        13111    13113       +2     
+ Misses       3018     3016       -2     

Flag	Coverage Δ
novstd	81.30% <100.00%> (+0.01%)	⬆️
unittests	81.30% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/input/search_paths.cpp	81.81% <100.00%> (ø)
src/vm/internal/pcall.hpp	83.97% <100.00%> (ø)
src/vm/internal/platform_utilities.cpp	79.03% <100.00%> (ø)

... and 2 files with indirect coverage changes

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