Don't use libgzip internal #definery outside libgzip

bin/varnishd/cache/cache_gzip.c

@@ -64,7 +64,7 @@ struct vgz {
 	z_stream		vz;
 };
 
-static inline z_const char *
+static const char *
 vgz_msg(const struct vgz *vg)
 {
 	CHECK_OBJ_NOTNULL(vg, VGZ_MAGIC);

bin/varnishd/waiter/cache_waiter_poll.c

@@ -141,6 +141,7 @@ vwp_main(void *priv)
 			vwp->hpoll--;
 		v = poll(vwp->pollfd, vwp->hpoll + 1, -1);
 		assert(v >= 0);
+usleep(1500000);
 		v2 = v;
 		now = VTIM_real();
 		idle = now - *vwp->waiter->tmo;