Reintroduce bezier polyfill

lua/entities/gmod_wire_expression2/core/vector.lua

@@ -14,6 +14,27 @@ local rad2deg = 180 / pi
 local deg2rad = pi / 180
 
 local LerpVector = LerpVector
+
+-- Remove this when a later, mandatory update is made.
+-- These were added in the August (08) 9 (09) 2023 (23) update
+if VERSION < 230809 then
+	function math.CubicBezier(frac, p0, p1, p2, p3)
+		local frac2 = frac * frac
+		local inv = 1 - frac
+		local inv2 = inv * inv
+
+		return inv2 * inv * p0 + 3 * inv2 * frac * p1 + 3 * inv * frac2 * p2 + frac2 * frac * p3
+	end
+
+	function math.QuadraticBezier(frac, p0, p1, p2)
+		local frac2 = frac * frac
+		local inv = 1 - frac
+		local inv2 = inv * inv
+
+		return inv2 * p0 + 2 * inv * frac * p1 + frac2 * p2
+	end
+end
+
 local quadraticBezier = math.QuadraticBezier
 local cubicBezier = math.CubicBezier