[gnome-settings-daemon] Add a note to POTFILES.in about the gvc submodule

[Piotr Drąg <piotrdrag src gnome org>]

commit 3e3f2c87c24913f841d9575b92d3cddf82a66f47
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Apr 14 21:49:48 2013 +0200

    Add a note to POTFILES.in about the gvc submodule

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 136ea74..32b647e 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -30,6 +30,7 @@ plugins/keyboard/gsd-keyboard-manager.c
 [type: gettext/ini]plugins/keyboard/keyboard.gnome-settings-plugin.in
 plugins/media-keys/gsd-media-keys-manager.c
 plugins/media-keys/gsd-screenshot-utils.c
+# Please do not remove this file from POTFILES.in. Run "git submodule init && git submodule update" to get 
it.
 plugins/media-keys/gvc/gvc-mixer-control.c
 [type: gettext/ini]plugins/media-keys/media-keys.gnome-settings-plugin.in
 plugins/media-keys/shortcuts-list.h