Enable structured logging output
Submitted by Philip Withnall
Assigned to David Zeuthen @david
Description
Using the new GLib structured logging support, send structured log messages to journald. This simplifies polkit's logging code a little, and allows more information to be sent to the journal. Specifically, MESSAGE_IDs can now be sent; and connecting directly to the journal means it will get the right process information.
This bumps the GLib dependency to 2.49.4.