[master] 6187f45 UDS listen sockets restrict VCL to >= 4.1

[Poul-Henning Kamp]

commit 6187f45a3b598c6761c7b7849bcab28f6d6310bb
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Wed Mar 14 10:55:41 2018 +0000

    UDS listen sockets restrict VCL to >= 4.1
    
    I had hoped for a more explanatory error message, but that is too
    involved at this point.

diff --git a/bin/varnishd/mgt/mgt_acceptor.c b/bin/varnishd/mgt/mgt_acceptor.c
index bffd461..796a11b 100644
--- a/bin/varnishd/mgt/mgt_acceptor.c
+++ b/bin/varnishd/mgt/mgt_acceptor.c
@@ -268,6 +268,9 @@ MAC_Arg(const char *spec)
 		ARGV_ERR("Unix domain socket addresses must be absolute paths "
 			 "in -a (%s)\n", la->endpoint);
 
+	if (*la->endpoint == '/' && heritage.min_vcl < 41)
+		heritage.min_vcl = 41;
+
 	for (int i = 2; av[i] != NULL; i++) {
 		char *eq, *val;
 		int len;