- Till now we didn't checked if a patch does really exist, so you will
  mostly just notice if you search the build log for files that were
  not found.
- By now we will issue a file not found warning for that case so
  problems related to not existing patch files will be more obvious.

Credits to the T2 project where I got this fix from.

Original log message (r20541):

* hardened the fl_wrapper to not segfault for unbalanced parent
  directory (..) references hitting the root (/) node
* fixed the fl_wrapper to also expand current (.) and parent (..)
  directory references whithout trailing slash and not leak trailing
  slashes

- We have to use test -c while checking for character devices.

- Packages cron and bcron are mutually exclusive.