libgnomeui 2.21.93

* Remove some dead code
* Fix a crash in the gio file chooser backend
* Fix a race in the gnome-vfs file chooser backend
* Use proper icons for "/", the Desktop and the user's 
  home directory 
* Show the "File System" mount in the file chooser's
  shortcuts
* Try to mount remote locations when getting the file info
  fails with a "Not mounted" error