wxWidgets defines _UNICODE globally, which causes Catch2's
catch_main.cpp to provide wmain() instead of main(). This leads to
LNK2001 "unresolved external symbol main" for all test executables
when building with BUILD_TESTS=ON on MSVC.
Add DO_NOT_USE_WMAIN compile definition to Catch2WithMain target
so that Catch2 provides the standard main() entry point.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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