fix: Fix gcc warning

[iTrooz]

See p-ranav/argparse#359

Note: this bug only showed up when switching to RelWithDebInfo to Release mode

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 25.04%. Comparing base (850e296) to head (c841662).

Files	Patch %	Lines
lib/source/pl/core/preprocessor.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #111   +/-   ##
=======================================
  Coverage   25.04%   25.04%           
=======================================
  Files         137      137           
  Lines        9940     9940           
  Branches     5506     5506           
=======================================
  Hits         2489     2489           
  Misses       4850     4850           
  Partials     2601     2601           

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