GroupManagerInterfaces: no virtual destructor, i think

src/grp_manager_interface.hh

@@ -31,8 +31,6 @@ namespace pEp {
                 ::pEp_identity *group_identity,
                 ::pEp_identity *group_member) noexcept = 0;
 
-            virtual ~GroupUpdateInterface() = 0;
-
         private:
         };
 
@@ -52,8 +50,6 @@ namespace pEp {
                 const ::pEp_identity *const group,
                 ::identity_list **members) noexcept = 0;
 
-            virtual ~GroupQueryInterface() = 0;
-
         private:
         };