Migrate all enumerators to venumerate() interface change

src/libcharon/plugins/dnscert/dnscert_cred.c

@@ -75,12 +75,15 @@ typedef struct {
 } cert_enumerator_t;
 
 METHOD(enumerator_t, cert_enumerator_enumerate, bool,
-	cert_enumerator_t *this, certificate_t **cert)
+	cert_enumerator_t *this, va_list args)
 {
+	certificate_t **cert;
 	dnscert_t *cur_crt;
 	rr_t *cur_rr;
 	chunk_t certificate;
 
+	VA_ARGS_VGET(args, cert);
+
 	/* Get the next supported CERT using the inner enumerator. */
 	while (this->inner->enumerate(this->inner, &cur_rr))
 	{
@@ -175,7 +178,8 @@ METHOD(credential_set_t, create_cert_enumerator, enumerator_t*,
 
 	INIT(e,
 		.public = {
-			.enumerate = (void*)_cert_enumerator_enumerate,
+			.enumerate = enumerator_enumerate_default,
+			.venumerate = _cert_enumerator_enumerate,
 			.destroy = _cert_enumerator_destroy,
 		},
 		.inner = response->get_rr_set(response)->create_rr_enumerator(