xfce 4.8pre3 preview

[Oliver Lehmann]

Hi,

I've updated the tarball.

- Use PLIST_SUB in thunars Makefile
- update orage to 4.8.0
- update mirror list in bsd.sites.mk

http://people.freebsd.org/~oliver/xfce/xfce-4.8pre3_ports.tar.gz

The PRs about updated xfce plugins - I've not included those updates as they
won't change the situation as far as I've seen about "port runs with  
4.8 or not".
This would be the only reason why I would include a new plugin version  
into the
4.8 upgrade. All other updates like "new features" should be handled  
seperatly.

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