Update our copy of xdg-utils to 2010-08-30, and include a patched xdg-mime.

third_party/xdg-utils/scripts/xdg-file-dialog.in

 #!/bin/sh
 #---------------------------------------------
 #   xdg-file-dialog
 #
 #   Utility script to file selection dialogs
 #   on XDG compliant systems.
 #
 #   Refer to the usage() function below for usage.
 #
 #   Copyright 2006, Kevin Krammer <kevin.krammer@gmx.at>
@@ skipping 241 matching lines @@
     action=openfilename
     ;;
 
   openfilenamelist)
     action=openfilenamelist
     ;;
 
   savefilename)
     action=savefilename
     ;;
-    
+
   directory)
     action=directory
     ;;
 
   *)
   exit_failure_syntax "unknown command '$1'"
   ;;
 esac
 
 shift
@@ skipping 81 matching lines @@
 
         gnome|xfce)
         directory_zenity "$filename"
         ;;
 
         *)
         exit_failure_operation_impossible "no method available for opening a directory dialog"
         ;;
     esac
 fi