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Remove non-standard M_PI (#3507)

Just use PI=acos(-1.0) as a local static constexpr. This has been causing build issues on windows.
J
John Shumway committed
355ce9230d9c4f2e74776e879f2bee71a26bae4a
Parent: 1da3400
Committed by GitHub <noreply@github.com> on 1/2/2026, 10:21:46 PM