server: fix unix domain socket for lws 4.0

src/server.c

@@ -458,6 +458,7 @@ int main(int argc, char **argv) {
     if (endswith(info.iface, ".sock") || endswith(info.iface, ".socket")) {
 #if defined(LWS_USE_UNIX_SOCK) || defined(LWS_WITH_UNIX_SOCK)
       info.options |= LWS_SERVER_OPTION_UNIX_SOCK;
+      info.port = 0; // warmcat/libwebsockets#1985
       strncpy(server->socket_path, info.iface, sizeof(server->socket_path) - 1);
 #else
       fprintf(stderr,