Fixes for at least one GCC bug

bin/varnishd/cache/cache_acceptor.c

@@ -120,7 +120,7 @@ static unsigned		need_test;
  */
 
 static int
-vca_tcp_opt_init()
+vca_tcp_opt_init(void)
 {
 	int n, x;
 	int one = 1;

bin/varnishd/cache/cache_vrt_vmod.c

@@ -120,7 +120,7 @@ VRT_Vmod_Init(void **hdl, void *ptr, int len, const char *nm,
 
 		if (strcmp(w, VMOD_ABI_Version)) {
 			VCLI_Out(cli, "Loading VMOD %s from %s:\n", nm, path);
-			VCLI_Out(cli, "VMOD ABI (%s)", w);
+			VCLI_Out(cli, "VMOD ABI (%s)", (char*)w);
 			VCLI_Out(cli, " incompatible with varnish ABI (%s)\n",
 			    VMOD_ABI_Version);
 			(void)dlclose(v->hdl);

lib/libvmod_directors/round_robin.c

@@ -134,7 +134,7 @@ vmod_round_robin__fini(struct req *req, struct vmod_directors_round_robin **rrp)
 		VTAILQ_REMOVE(&rr->listhead, ep, list);
 		FREE_OBJ(ep);
 	}
-	REPLACE(rr->dir->vcl_name, NULL);
+	free(rr->dir->vcl_name);
 	FREE_OBJ(rr->dir);
 	FREE_OBJ(rr);
 }