Disable bad "deprecated warning" edge-case in BDCSVD

What does this implement/fix?

This fixes a couple of invalid deprecation warnings in BDCSVD. If no computationOptions are set with the runtime parameters, BDCSVD dispatches to JacobiSVD at runtime. BDCSVD has to pass a 0 as the computationOptions to JacobiSVD's deprecated constructor. Unfortunately, I don't think there is a simple way to naturally prevent this in the implementation. So, I just disable the warning when bdcsvd tries to call jacobisvd's deprecated constructor. 🤷

#include <Eigen/Core>
#include <Eigen/SVD>

int main() {
  Eigen::MatrixXd m = Eigen::MatrixXd::Random(100, 100);

  // Valid input, to get the singular values, but shows deprecation warning for JacobiSVD!
  Eigen::BDCSVD<Eigen::MatrixXd> svd1(m);

  // Deprecated warning for both BDCSVD and JacobiSVD.
  Eigen::BDCSVD<Eigen::MatrixXd> svd2(m, Eigen::ComputeFullU);
  return 0;
}        

I just borrowed the stuff to disable the warning from highway. this should work for the compiler versions eigen supports...