make destructor virtual

src/ELECTRODE/electrode_kspace.h

@@ -23,6 +23,7 @@
 namespace LAMMPS_NS {
 class ElectrodeKSpace {
  public:
+  virtual ~ElectrodeKSpace() noexcept(false) {};
   virtual void compute_vector(double *, int, int, bool) = 0;
   virtual void compute_vector_corr(double *, int, int, bool) = 0;
   virtual void compute_matrix(bigint *, double **, bool) = 0;