const math.c4

2 uses

	math (current package)
		erfinv.go#L38: 	c4 = 1.27045825245236838258e0
		erfinv.go#L102: 			z1 = ((((((c7*r+c6)*r+c5)*r+c4)*r+c3)*r+c2)*r+c1)*r + c0