Computes the real-valued roots of the 2nd order polynomial function of one variable with only real coefficients.
Example
czm_quadraticRoots r = czm_quadraticRealPolynomialRealRoots(2.0, -4.0, -6.0); // 2(x + 1)(x - 3) // The result is r.numberOfRoots = 2, r.root0 = -1.0, and r.root1 = 3.0.