[gnome-settings-daemon] wacom: Fix missing constant

[Bastien Nocera <hadess src gnome org>]

commit 56c21237200d90ed49be06f74d4ceda7f81a1c52
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jul 15 19:07:10 2013 +0200

    wacom: Fix missing constant
    
    Which was in the other patch in bug 700499.

 plugins/wacom/gsd-wacom-oled.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/wacom/gsd-wacom-oled.c b/plugins/wacom/gsd-wacom-oled.c
index 6b7c11c..1eb9464 100644
--- a/plugins/wacom/gsd-wacom-oled.c
+++ b/plugins/wacom/gsd-wacom-oled.c
@@ -31,6 +31,8 @@
 #include "gsd-wacom-device.h"
 #include "gsd-wacom-oled.h"
 
+#define MAGIC_BASE64        "base64:"        /*Label starting with base64: is treated as already encoded*/
+
 static void
 oled_scramble_icon (guchar* image)
 {