cmd-buildextend-hashlist-experimental: permission changes

Change in find invocation

src/cmd-buildextend-hashlist-experimental

@@ -94,7 +94,7 @@ class HashListV1(dict):
         # Force all dirs to be owner writable so that we can delete the
         # checkout at the end. XXX: Lower into a new `ostree checkout` flag.
         subprocess.check_call(['find', checkout, '-type', 'd', '-exec',
-                               'chmod', 'u+w', '{}', '+'])
+                               'chmod', 'u+rwx', '{}', ';'])
         self.hash_from_path(checkout)
 
         # Extract initramfs contents