BUG/MINOR: init: -S can have a parameter starting with a dash

There is no reason the -S option can't take an argument which starts with
a -. This limitation must only be used for options that take a
non-finite list of parameters (-sf/-st)

This can be backported only if the previous patch which fixes
copy_argv() is backported too.

Could be backported as far as 1.9.

(cherry picked from commit a6b3249935cf8e4de53b9940419683ef82cb40b8)
Signed-off-by: William Lallemand <wlallemand@haproxy.org>
(cherry picked from commit a1de71f2577ee9cf071eefd36e1d445deba29388)
Signed-off-by: William Lallemand <wlallemand@haproxy.org>
diff --git a/src/haproxy.c b/src/haproxy.c
index 3757bdf..54cbe0a 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -1691,7 +1691,7 @@
 			else if (*flag == 'S') {
 				struct wordlist *c;
 
-				if (argc <= 1 || argv[1][0] == '-') {
+				if (argc <= 1) {
 					ha_alert("Socket and optional bind parameters expected with the -S flag\n");
 					usage(progname);
 				}