tracker: Eliminate duplicate search results
tracker: Eliminate duplicate search results

Add a DISTINCT to the query to eliminate duplicate search results when
using grl_source_browse() on a grl-tracker source. Unlike other uses of
DISTINCT in the source, it is not conditional on the browse-filesystem
config key being enabled.

https://bugzilla.gnome.org/show_bug.cgi?id=748539

GNOME/grilo-plugins,grilofw/grilo-plugins,jasuarez/grilo-plugins,MikePetullo/grilo-plugins,MikePetullo/grilo-plugins,grilofw/grilo-plugins,jasuarez/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins