Removes references to mibstore.h and miInitializeBackingStore, which
have been removed from xorg-server.  Zack Rusin <zackr@vmware.com>
wrote: "It was a noop for at least 5 years and it has been removed."
See: http://patches.openembedded.org/patch/46133/

--- xf86-video-glint-1.2.8/src/glint_driver.c.~1~	2012-07-15 22:50:47.000000000 -0400
+++ xf86-video-glint-1.2.8/src/glint_driver.c	2014-12-19 00:42:39.162714279 -0500
@@ -52,8 +52,6 @@
 #include "compiler.h"
 #include "mipointer.h"
 
-#include "mibstore.h"
-
 #include "pm3_regs.h"
 #include "glint_regs.h"
 #include "IBM.h"
@@ -2904,7 +2902,6 @@
         }
     }
 
-    miInitializeBackingStore(pScreen);
     xf86SetBackingStore(pScreen);
     xf86SetSilkenMouse(pScreen);
 
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