remove prototype pathops code

experimental/Intersection/QuadraticParameterization_TestUtility.cpp

-// included by QuadraticParameterization.cpp
-// accesses internal functions to validate parameterized coefficients
-
-#include "Parameterization_Test.h"
-
-bool point_on_parameterized_curve(const Quadratic& quad, const _Point& point) {
-    QuadImplicitForm q(quad);
-    double  xx = q.x2() * point.x * point.x;
-    double  xy = q.xy() * point.x * point.y;
-    double  yy = q.y2() * point.y * point.y;
-    double   x = q.x() * point.x;
-    double   y = q.y() * point.y;
-    double   c = q.c();
-    double sum = xx + xy + yy + x + y + c;
-    return approximately_zero(sum);
-}