remove default destructors

src/sat/smt/euf_proof_checker.cpp

@@ -296,9 +296,6 @@ namespace euf {
         add_plugin(alloc(bv::theory_checker, m));
     }
 
-    theory_checker::~theory_checker() {
-    }
-
     void theory_checker::add_plugin(theory_checker_plugin* p) {
         m_plugins.push_back(p);
         p->register_plugins(*this);

src/sat/smt/euf_proof_checker.h

@@ -45,7 +45,6 @@ namespace euf {
         void add_plugin(theory_checker_plugin* p);
     public:
         theory_checker(ast_manager& m);
-        ~theory_checker();
         void register_plugin(symbol const& rule, theory_checker_plugin*);
         bool check(expr* jst);
         expr_ref_vector clause(expr* jst);

src/sat/smt/q_mam.cpp

@@ -2000,9 +2000,6 @@ namespace q {
             m_args.resize(INIT_ARGS_SIZE);
         }
 
-        ~interpreter() {
-        }
-
         void init(code_tree * t) {
             TRACE("mam_bug", tout << "preparing to match tree:\n" << *t << "\n";);
             m_registers.reserve(t->get_num_regs(), nullptr);

src/sat/smt/specrel_solver.cpp

@@ -32,9 +32,6 @@ namespace specrel {
         ctx.get_egraph().add_plugin(alloc(euf::specrel_plugin, ctx.get_egraph()));
     }
 
-    solver::~solver() {
-    }
-
     void solver::asserted(sat::literal l) {
 
     }

src/sat/smt/specrel_solver.h

@@ -39,7 +39,6 @@ namespace specrel {
         
     public:
         solver(euf::solver& ctx, theory_id id);
-        ~solver() override;
 
         bool is_external(bool_var v) override { return false; }
         void get_antecedents(literal l, sat::ext_justification_idx idx, literal_vector& r, bool probing) override {}