[mutter] Don't redefine MetaBackgroundPrivate, fixing a build issue:

[Jasper Lievisse Adriaanse <jasperla src gnome org>]

commit 992a15e6401114a67450dcf10b080044caab6b31
Author: Jasper Lievisse Adriaanse <jasper humppa nl>
Date:   Fri Mar 29 16:59:26 2013 +0100

    Don't redefine MetaBackgroundPrivate, fixing a build issue:
    
    compositor/meta-background.c:64: error: redefinition of typedef 'MetaBackgroundPrivate'
    ./meta/meta-background.h:51: error: previous declaration of 'MetaBackgroundPrivate' was here

 src/compositor/meta-background.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-background.c b/src/compositor/meta-background.c
index d15b06c..727000f 100644
--- a/src/compositor/meta-background.c
+++ b/src/compositor/meta-background.c
@@ -61,7 +61,6 @@
  *
  * This object provides a ClutterContent object to assist in sharing between actors.
  */
-typedef struct _MetaBackgroundPrivate MetaBackgroundPrivate;
 
 struct _MetaBackgroundPrivate
 {