Directly code failing example, or it breaks make doc.

unsupported/doc/examples/MatrixPower_failure.cpp

@@ -1,20 +0,0 @@
-#include <unsupported/Eigen/MatrixFunctions>
-#include <iostream>
-
-int main()
-{
-  Eigen::Matrix4d A;
-  A << 0, 0, 2, 3,
-       0, 0, 4, 5,
-       0, 0, 6, 7,
-       0, 0, 8, 9;
-  std::cout << A.pow(0.37) << std::endl;
-  
-  // The 1 makes eigenvalue 0 non-semisimple.
-  A.coeffRef(0, 1) = 1;
-
-  // This fails if EIGEN_NO_DEBUG is undefined.
-  std::cout << A.pow(0.37) << std::endl;
-
-  return 0;
-}