scons: Adjust the warnings for VS.
Silence insignificant warnings so significant warnings have a chance to stand out. The only abundant warning that's not silenced here is "C4018: signed/unsigned mismatch", as it could hide security issues, so it's better to actually fix the code. Reviewed-by: Brian Paul <email@example.com> Reviewed-by: Roland Scheidegger <firstname.lastname@example.org>
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