Clean up DOS ifdef

[mgeplf]

No description provided.

[mgeplf]

From what I can tell, the DOS define wasn't being defined anywhere, and I couldn't find a compiler that defines it automatically.

I think it would be worth having @nrnhines to have a look, since he knows the history, and what this was originally intended for.

[sonarcloud]

Please retry analysis of this Pull-Request directly on SonarCloud

[pramodk]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.19%. Comparing base (d99cbb5) to head (38b8867).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2872      +/-   ##
==========================================
+ Coverage   67.18%   67.19%   +0.01%     
==========================================
  Files         564      563       -1     
  Lines      104268   104244      -24     
==========================================
- Hits        70053    70048       -5     
+ Misses      34215    34196      -19     

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