Bug#908800: nautilus: can't use nautilus without tracker

[Jeremy Bicha]

This problem was introduced by
https://gitlab.gnome.org/GNOME/tracker/commit/ee07c990

Here are some options:

1) We could revert that commit but maybe that's not a good idea. Apps
would still emit warnings when the tracker libraries can't find those
ontology rules.

2) We could have the apps that build against tracker depend on
tracker. Most already do, but this means nautilus, brasero, and the
brasero fork kylin-burner. I'm not sure that the tracker integration
in brasero works and I don't think it's very useful there, but the
dependency probably wouldn't hurt. We have some good arguments for
nautilus to now depend on tracker too.

3) We could introduce a tracker-common package including
/usr/share/tracker/ and /usr/share/locale/ and have the tracker
library packages depend on it.

So I'm leaning towards #3 (and independently having nautilus depend on
tracker). What do the rest of you think?

Thanks,
Jeremy Bicha