[gnome-flashback] sound-applet: update submodule to fix few build warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

commit cfd0a8153bd82a0c51296dbf8239ba12b20eac9e
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 9 16:29:37 2015 +0300

    sound-applet: update submodule to fix few build warnings

 gnome-flashback/libsound-applet/gvc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnome-flashback/libsound-applet/gvc b/gnome-flashback/libsound-applet/gvc
index fac3a90..b7bce32 160000
--- a/gnome-flashback/libsound-applet/gvc
+++ b/gnome-flashback/libsound-applet/gvc
@@ -1 +1 @@
-Subproject commit fac3a900e5de2c60d667c54f2727e806d29cff4b
+Subproject commit b7bce3294492bbeb453bb56110b9ef8583ac4512