cmake DEAL_II_HAVE_CXX17_BESSEL_FUNCTIONS examples

dealii/dealii cmake/checks/check_01_cxx_features.cmake :572 

CHECK_CXX_SOURCE_COMPILES(
  "
  #include <cmath>
  using std::cyl_bessel_j;
  using std::cyl_bessel_jf;
  int main()
  {
  }
  "
  DEAL_II_HAVE_CXX17_BESSEL_FUNCTIONS
  )