Linux: update xdg-utils again, and check in the built versions of the scripts.

scripts/xdg-utils-common.in

Index: scripts/xdg-utils-common.in
===================================================================
--- scripts/xdg-utils-common.in	(revision 79914)
+++ scripts/xdg-utils-common.in	(working copy)
@@ -200,7 +200,7 @@
     fi
 
     if [ x"$DE" = x"" ]; then
-    # if all else fails, fallback to checking $DESKTOP_SESSION
+      # fallback to checking $DESKTOP_SESSION
       case "$DESKTOP_SESSION" in
          LXDE)
            DE=lxde; 
@@ -211,6 +211,15 @@
       esac
     fi
 
+    if [ x"$DE" = x"" ]; then
+      # fallback to uname output for other platforms
+      case "$(uname 2>/dev/null)" in 
+        Darwin)
+          DE=darwin;
+          ;;
+      esac
+    fi
+
     if [ x"$DE" = x"gnome" ]; then
       # gnome-default-applications-properties is only available in GNOME 2.x
       # but not in GNOME 3.x