remove prototype pathops code

experimental/Intersection/CubicParameterization_TestUtility.cpp

-// included by CubicParameterization.cpp
-// accesses internal functions to validate parameterized coefficients
-
-#include "Parameterization_Test.h"
-
-static void parameter_coeffs(const Cubic& cubic, double coeffs[coeff_count]) {
-#if USE_SYVESTER
-    double ax, bx, cx, dx;
-    if (try_alt)
-        alt_set_abcd(&cubic[0].x, ax, bx, cx, dx);
-    else
-        set_abcd(&cubic[0].x, ax, bx, cx, dx);
-    double ay, by, cy, dy;
-    if (try_alt)
-        alt_set_abcd(&cubic[0].y, ay, by, cy, dy);
-    else
-        set_abcd(&cubic[0].y, ay, by, cy, dy);
-    calc_ABCD(ax, ay, coeffs);
-    if (!try_alt) calc_bc(dx, bx, cx);
-    if (!try_alt) calc_bc(dy, by, cy);
-#else
-    double ax = cubic[0].x;
-    double bx = cubic[1].x;
-    double cx = cubic[2].x;
-    double dx = cubic[3].x;
-    double ay = cubic[0].y;
-    double by = cubic[1].y;
-    double cy = cubic[2].y;
-    double dy = cubic[3].y;
-    calc_ABCD(ax, bx, cx, dx, ay, by, cy, dy, coeffs);
-#endif
-    for (int index = xx_coeff; index < coeff_count; ++index) {
-        int procIndex = index - xx_coeff;
-        coeffs[index] = (*calc_proc[procIndex])(ax, bx, cx, dx, ay, by, cy, dy);
-    }
-}
-
-bool point_on_parameterized_curve(const Cubic& cubic, const _Point& point) {
-    double coeffs[coeff_count];
-    parameter_coeffs(cubic, coeffs);
-    double xxx = coeffs[xxx_coeff] * point.x * point.x * point.x;
-    double xxy = coeffs[xxy_coeff] * point.x * point.x * point.y;
-    double xyy = coeffs[xyy_coeff] * point.x * point.y * point.y;
-    double yyy = coeffs[yyy_coeff] * point.y * point.y * point.y;
-    double  xx = coeffs[ xx_coeff] * point.x * point.x;
-    double  xy = coeffs[ xy_coeff] * point.x * point.y;
-    double  yy = coeffs[ yy_coeff] * point.y * point.y;
-    double   x = coeffs[  x_coeff] * point.x;
-    double   y = coeffs[  y_coeff] * point.y;
-    double   c = coeffs[  c_coeff];
-    double sum = xxx + xxy + xyy + yyy + xx + xy + yy + x + y + c;
-    return approximately_zero(sum);
-}