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The `X-GNOME-Bugzilla-*` entries were for use by bug-buddy, a GNOME 2 technology that's been gone for over a decade. These entries are obsolete and can be removed from the desktop files. The desktop files then have no variables so do not need to be configured. They are renamed from `*.in.in` to `*.in` to reflect that and build files are updated for this change.
