Log Message:
Update python dbus bindings to 1.2.4.

D-Bus Python Bindings 1.2.4 (2016-03-06)
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The “75,000 microchips” release.

Enhancements:

• Continous integration metadata for travis-ci.org is now available.
  Similar to dbus, this is split into .travis.yml (Travis-specifics)
  and tools/ci-build.sh (intended to be useful for any CI framework,
  although it does include various workarounds for travis-ci oddities).
  (Simon McVittie)

Fixes:

• Make dbus.version a tuple again, not a list, for consistent sorting.
  This was a regression in 1.2.2. (Debian #816729, Simon McVittie)

• Use inspect.signature() instead of inspect.getargspec() on Python
  versions that have it. inspect.getargspec() is deprecated in recent
  Python 3 and seems to have disappeared from 3.6 nightly builds.
  (Simon McVittie)

• Make the tests pass in "narrow" Python builds where unicode objects
  are UTF-16, rather than the UCS-4 used in Linux distributions.
  (fd.o #57140, Simon McVittie)

• Always include headers in a consistent order (Debian #749133, Simon McVittie)

• Include config.h in all C code that we compile. This is necessary
  on platforms where it might contain something like "#define _GNU_SOURCE"
  or "#define inline __inline".
  (Simon McVittie)