Fix: ss-local and ss-redir should also respect ipv6_first.

src/local.c

@@ -1471,6 +1471,9 @@ main(int argc, char **argv)
             nofile = conf->nofile;
         }
 #endif
+        if (ipv6first == 0) {
+            ipv6first = conf->ipv6_first;
+        }
     }
 
     if (remote_num == 0 || remote_port == NULL ||

src/redir.c

@@ -1080,6 +1080,9 @@ main(int argc, char **argv)
             nofile = conf->nofile;
         }
 #endif
+        if (ipv6first == 0) {
+            ipv6first = conf->ipv6_first;
+        }
 	dscp_num = conf->dscp_num;
 	dscp = conf->dscp;
     }