Log Message:
dbus: update to 1.12.6.

dbus 1.12.6 (2018-03-01)
========================

The “just the one swan, actually” release.

Fixes:

• Increase system dbus-daemon's RLIMIT_NOFILE rlimit before it drops
  privileges, because it won't have permission afterwards. This fixes a
  regression in dbus 1.10.18 and 1.11.0 which made the standard system bus
  more susceptible to deliberate or accidental denial of service.
  (fd.o #105165, David King)