[Tracker] t-s-t patch to remove gnome-open in favour of xdg-open

["Tshepang Lekhonkhobe" <tshepang gmail com>]

Hi,

Please review and comment if this patch is a good idea or not:
It removes the code for the fallback option of opening folders with
nautilus when xdg-utils is not installed. The consequence is that one
must have xdg-utils installed for this to work.
I don't know nothing about config.in stuff to make the ./configure run
check for xdg-utils presence, so may someone help with that, please...

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