[gnome-control-center] gvc: Update to latest master

[Bastien Nocera <hadess src gnome org>]

commit edc40ccf7db0d06395155c9e3792e6ccf82e8c57
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jan 28 10:28:26 2013 +0100

    gvc: Update to latest master
    
    Fix a compile-time warning:
    cc1: warning: ./gvc/: No such file or directory [enabled by default]

 panels/sound/gvc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/sound/gvc b/panels/sound/gvc
index f3df56c..03894ef 160000
--- a/panels/sound/gvc
+++ b/panels/sound/gvc
@@ -1 +1 @@
-Subproject commit f3df56c399279f52b141b4a2fa3df0b08bdcec55
+Subproject commit 03894efbcd010faf53bbc6e27256d27485f721b8