Polish min usage for SunCC

Fixes: left operand must be modifiable lvalue: op "="

bin/varnishd/http2/cache_http2_send.c

@@ -218,7 +218,7 @@ h2_win_limit(const struct h2_req *r2, const struct h2_sess *h2)
 	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
 
 	Lck_AssertHeld(&h2->sess->mtx);
-	return (vmin(r2->t_window, h2->req0->t_window));
+	return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
 }
 
 static void

lib/libvcc/vcc_acl.c

@@ -105,7 +105,7 @@ vcl_acl_cmp(const struct acl_e *ae1, const struct acl_e *ae2)
 
 	p1 = ae1->data;
 	p2 = ae2->data;
-	m = vmin(ae1->mask, ae2->mask);
+	m = vmin_t(unsigned, ae1->mask, ae2->mask);
 	for (; m >= 8; m -= 8) {
 		CMP(*p1, *p2);
 		p1++;

vmod/vmod_directors_shard_cfg.c

@@ -282,7 +282,7 @@ shardcfg_hashcircle(struct sharddir *shardd)
 	rmax = (UINT32_MAX - 1) / shardd->n_backend;
 	for (b = backends; b < backends + shardd->n_backend; b++) {
 		CHECK_OBJ_NOTNULL(b->backend, DIRECTOR_MAGIC);
-		n_points += vmin(b->replicas, rmax);
+		n_points += vmin_t(uint32_t, b->replicas, rmax);
 	}
 
 	assert(n_points < UINT32_MAX);
@@ -298,7 +298,7 @@ shardcfg_hashcircle(struct sharddir *shardd)
 		AN(ident);
 		assert(ident[0] != '\0');
 
-		r = vmin(b->replicas, rmax);
+		r = vmin_t(uint32_t, b->replicas, rmax);
 
 		for (j = 0; j < r; j++) {
 			assert(snprintf(s, len, "%d", j) < len);