Stop processing arguments at -c

Original patch by Neil Moore <neil@s-z.org>

dgamelaunch.c

@@ -2719,15 +2719,15 @@ main (int argc, char** argv)
 
   __progname = basename(strdup(argv[0]));
 
-  while ((c = getopt(argc, argv, "c:sqh:pi:aeW:SD")) != -1)
+  while ((c = getopt(argc, argv, "csqh:pi:aeW:SD")) != -1)
   {
+      /* Stop processing arguments at -c, so that user-provided
+       * commands (via ssh for example) to the dgamelaunch login
+       * shell are ignored.
+       */
+    if (c == 'c') break;
     switch (c)
     {
-      case 'c':
-        fprintf(stderr, "This is not a shell account, you can't execute "
-                        "arbitrary commands.\n");
-        graceful_exit(15);
-        break;
       case 's':
 	showplayers = 1; break;