move respond_to and instance_of prototypes to mruby.h

include/mruby.h

@@ -557,6 +557,9 @@ int mrb_sourceline(void);
 void ruby_default_signal(int sig);
 mrb_value mrb_attr_get(mrb_state *mrb, mrb_value obj, mrb_sym id);
 
+int mrb_respond_to(mrb_state *mrb, mrb_value obj, mrb_sym mid);
+int mrb_obj_is_instance_of(mrb_state *mrb, mrb_value obj, struct RClass* c);
+
 /* memory pool implementation */
 typedef struct mrb_pool mrb_pool;
 struct mrb_pool* mrb_pool_open(mrb_state*);

include/mruby/class.h

@@ -74,8 +74,6 @@ struct RClass *mrb_class_outer_module(mrb_state*, struct RClass *);
 struct RProc *mrb_method_search_vm(mrb_state*, struct RClass**, mrb_sym);
 struct RProc *mrb_method_search(mrb_state*, struct RClass*, mrb_sym);
 
-int mrb_respond_to(mrb_state *mrb, mrb_value obj, mrb_sym mid);
-int mrb_obj_is_instance_of(mrb_state *mrb, mrb_value obj, struct RClass* c);
 struct RClass* mrb_class_real(struct RClass* cl);
 
 void mrb_obj_call_init(mrb_state *mrb, mrb_value obj, int argc, mrb_value *argv);