xfce4-time-out-plugin: update to 1.1.2

Change log:

1.1.2
======
- Check whether the seat exists before ungrabbing it
- Create README.md. Update configure.ac.in
- Fix compilation warnings
- autoconf: Some updates
- fix for no dialog after screenlock issue (#13)
- Remove GSourceFunc casts (!2)
- Translation Updates:
  Albanian, Basque, Belarusian, Catalan, Chinese (China), Chinese
  (Taiwan), Czech, English (Canada), French, Galician, Hebrew,
  Hungarian, Indonesian, Interlingue, Italian, Japanese, Kazakh,
  Korean, Norwegian Bokm奪l, Portuguese, Portuguese (Brazil), Serbian,
  Slovak, Slovenian, Spanish, Turkish, Uyghur

(gutteridge)