fix NMAKE $< warning U4006

[srz-zumix]

fixed #488

[codecov]

Codecov Report

Merging #518 into develop will decrease coverage by 0.02%.
The diff coverage is 94.69%.

@@             Coverage Diff             @@
##           develop     #518      +/-   ##
===========================================
- Coverage    96.76%   96.73%   -0.03%     
===========================================
  Files          220      222       +2     
  Lines        11310    11425     +115     
===========================================
+ Hits         10944    11052     +108     
- Misses         366      373       +7     

Impacted Files	Coverage Δ
include/internal/iutest_exception.hpp	100.00% <ø> (ø)
include/internal/iutest_list.hpp	100.00% <ø> (ø)
include/iutest_body.hpp	96.15% <ø> (ø)
include/iutest_info.hpp	100.00% <ø> (ø)
test/printers_tests.cpp	93.67% <ø> (ø)
test/invalid_both_suite_and_case_set_up_tests.cpp	82.35% <66.66%> (ø)
...est/invalid_both_suite_and_case_teardown_tests.cpp	82.35% <66.66%> (-3.37%)	⬇️
test/exception_set_up_testsuite_tests.cpp	78.57% <78.57%> (ø)
test/exception_tests.cpp	93.75% <85.71%> (-6.25%)	⬇️
test/scoped_trace_exception_tests.cpp	98.38% <98.38%> (ø)
... and 8 more

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