Add missing stdexcept header

[hmenke]

Pull request purpose

Fix compiler errors with some version of libstdc++ (maybe other C++ standard libraries are also affected).

/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:68:16: error: no member named 'domain_error' in namespace 'std'
   68 |     throw std::domain_error("Error inside ARPACK routines");
      |           ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:76:28: error: no member named 'runtime_error' in namespace 'std'
   76 |   if (info < 0) throw std::runtime_error("Error in seupd, info " + std::to_string(info));
      |                       ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:85:37: error: no member named 'domain_error' in namespace 'std'
   85 |     if (eps > tol_check) throw std::domain_error("Correct eigenvalues not computed");
      |                                ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:142:16: error: no member named 'domain_error' in namespace 'std'
  142 |     throw std::domain_error("Error inside ARPACK routines");
      |           ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:150:28: error: no member named 'runtime_error' in namespace 'std'
  150 |   if (info < 0) throw std::runtime_error("Error in neupd, info " + std::to_string(info));
      |                       ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:162:60: error: no member named 'domain_error' in namespace 'std'
  162 |       if (reps > tol_check || ieps > tol_check) throw std::domain_error("Correct eigenvalues not computed");
      |                                                       ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:174:60: error: no member named 'domain_error' in namespace 'std'
  174 |       if (reps > tol_check || ieps > tol_check) throw std::domain_error("Correct eigenvalues not computed");
      |                                                       ~~~~~^
/home/abuild/rpmbuild/BUILD/arpack-ng-3.9.1/TESTS/icb_arpack_cpp.cpp:177:16: error: no member named 'domain_error' in namespace 'std'
  177 |     throw std::domain_error("The input Ritz option is not allowed in this test file.");
      |           ~~~~~^
8 errors generated.

Detailed changes proposed in this pull request

• Add missing stdexcept header

[fghoussen]

Thanks! Can you update the changelog?

[fghoussen]

@hmenke Thanks!