deploy: Replace a use of gs_file_enumerator with compat wrapper

More libglnx/glib porting.

Closes: #423
Approved by: giuseppe

src/libostree/ostree-sysroot-deploy.c

@@ -662,8 +662,8 @@ relabel_recursively (OstreeSysroot  *sysroot,
       GFile *child;
       GFileType ftype;
 
-      if (!gs_file_enumerator_iterate (direnum, &file_info, &child,
-                                       cancellable, error))
+      if (!g_file_enumerator_iterate (direnum, &file_info, &child,
+                                      cancellable, error))
         goto out;
       if (file_info == NULL)
         break;