gmessages: Add timestamp to g_log_writer_format_fields()
gmessages: Add timestamp to g_log_writer_format_fields()

Since journald adds a timestamp, it would be useful to add one to the
stdout/stderr output too — we do not want it to miss out on the
timestamping fun.

Make it blue, because we can.

https://bugzilla.gnome.org/show_bug.cgi?id=769846

johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,endlessm/glib