Disabled external gits

cs440-acg/ext/eigen/doc/examples/TutorialLinAlgSVDSolve.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+using namespace std;
+using namespace Eigen;
+
+int main()
+{
+   MatrixXf A = MatrixXf::Random(3, 2);
+   cout << "Here is the matrix A:\n" << A << endl;
+   VectorXf b = VectorXf::Random(3);
+   cout << "Here is the right hand side b:\n" << b << endl;
+   cout << "The least-squares solution is:\n"
+        << A.bdcSvd(ComputeThinU | ComputeThinV).solve(b) << endl;
+}