gst-ffmpeg: Automatic update of common submodule

[Stefan Kost]

Module: gst-ffmpeg
Branch: master
Commit: 47bf93d84bc911e6ff7f2fb6d81175f91f1933e3
URL:    http://cgit.freedesktop.org/gstreamer/gst-ffmpeg/commit/?id=47bf93d84bc911e6ff7f2fb6d81175f91f1933e3

Author: Stefan Sauer <ensonic at users.sf.net>
Date:   Tue Sep  6 16:06:23 2011 +0200

Automatic update of common submodule