[gnome-shell] Update libgnome-volume-control to master

[Giovanni Campagna <gcampagna src gnome org>]

commit 95a1b874d8298bc9d4b050d8361927a0da603e5e
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Mar 11 22:22:49 2013 +0100

    Update libgnome-volume-control to master
    
    Pick a few fixes, including a memory leak fix.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695656

 src/gvc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gvc b/src/gvc
index 03894ef..3d6aac6 160000
--- a/src/gvc
+++ b/src/gvc
@@ -1 +1 @@
-Subproject commit 03894efbcd010faf53bbc6e27256d27485f721b8
+Subproject commit 3d6aac673b88fff548db57a75b82e8f14723c1fe