Log Message:
xfce4-exo: update to 4.16.3

Change log:

4.16.3
======
- Dont reduce selection in single click mode (Issue #71)
- Add typecheck to prevent Gtk-CRITICAL (Issue #63)
- exo_strdup_strftime: Support additional encoding (Issue #66)
- Free hover_path in tree-view if not NULL
- Fix compilation warnings
- exo-icon-chooser-dialog: Focus filter entry by default
- exo-icon-chooser-dialog: Set default to show to all icons
- exo-icon-chooser-dialog: Speed up sorting the icon view model