Fix a couple of old-style functions

bin/varnishd/storage/stevedore.c

@@ -50,7 +50,7 @@ static pthread_mutex_t stv_mtx;
  */
 
 const struct stevedore *
-STV_next()
+STV_next(void)
 {
 	static struct stevedore *stv;
 	struct stevedore *r;

lib/libvarnish/vsa.c

@@ -188,7 +188,7 @@ static struct suckaddr bogo_ip6_vsa;
 const struct suckaddr *bogo_ip6 = &bogo_ip6_vsa;
 
 void
-VSA_Init()
+VSA_Init(void)
 {
 	AN(VSA_BuildFAP(&bogo_ip_vsa, PF_INET, NULL, 0, NULL, 0));
 	AN(VSA_BuildFAP(&bogo_ip6_vsa, PF_INET6, NULL, 0, NULL, 0));