The Windows SDK's winbase.h raises C5105, which /W4 /WX promotes to error
C2220, so every MSVC build of the native /cso helper failed, and setup
mapped every probe failure to 'install Visual Studio 2022 Build Tools'.
Both compile lines add /wd5105 (only that diagnostic), and setup keeps the
probe's output: a probe that found MSVC but failed to compile reports
windows-msvc-compile with the compiler's first error. Not run on Windows:
the mapping test stubs powershell.exe; the ps1 assertion runs everywhere.
Co-authored-by: AlinValentin7 <AlinValentin7@users.noreply.github.com>
