Upstream merge of Debian 2.42.1 packaging (no quilt patches)

Source has been updated with changes from git and we use the Debian
packaging data here to match those up.

[endlessm/eos-shell#3276]
@dbnicholson and I talked a bit and there are two options here since dbus pulls in systems and then this change becomes too intrusive:
- Try to build tracker w/ older glib
- Try to build glib w/ older dbus

Since the work is already done on merging upstream glib2, I will probably try the latter first though at some point in time we really need to consider upgrading all our core packages for both feature support and security patches but we need to have ample time to QA/fix bugs.