[totem] backend: Fix compilation with older versions of GStreamer

[Bastien Nocera <hadess src gnome org>]

commit 99c517826cac8b786f0651598c0beeb5451d078a
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Dec 20 16:34:58 2012 +0100

    backend: Fix compilation with older versions of GStreamer
    
    Which would require
     #include <gst/audio/streamvolume.h>
    at least to compile.

 src/backend/bacon-video-widget.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index c3b16cc..3345fcf 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -54,6 +54,7 @@
 #include <gst/video/gstvideosink.h>
 #include <gst/video/video.h>
 #include <gst/audio/audio.h>
+#include <gst/audio/streamvolume.h>
 
 /* for missing decoder/demuxer detection */
 #include <gst/pbutils/pbutils.h>