Remove declarations of symbols that are never defined.

These symbols were removed from the X Server, or never declared.
  One symbol that may need special attention is XkbBuildCoreState(),
that doesn't have a prototype anywhere, but is called from
xkb/xkbEvents.c:XkbFilterEvents(), and also used by the macros
XkbStateFieldFromRec() and XkbGrabStateFromRec() defined in
include/xkbstr.h.
  fb/wfbrename.h also may need some cleanup, as it makes several
"renames" of non existing symbols.

fb/fb.h

@@ -1675,19 +1675,6 @@ fbPushFill (DrawablePtr	pDrawable,
 	    int		width,
 	    int		height);
 
-void
-fbPush1toN (DrawablePtr	pSrcDrawable,
-	    DrawablePtr	pDstDrawable,
-	    GCPtr	pGC,
-	    BoxPtr	pbox,
-	    int		nbox,
-	    int		dx,
-	    int		dy,
-	    Bool	reverse,
-	    Bool	upsidedown,
-	    Pixel	bitplane,
-	    void	*closure);
-
 void
 fbPushImage (DrawablePtr    pDrawable,
 	     GCPtr	    pGC,
@@ -1788,9 +1775,6 @@ fbScreenInit(ScreenPtr	pScreen,
 	     int	dpiy,
 	     int	width,
 	     int	bpp);
-
-void
-fbInitializeBackingStore (ScreenPtr pScreen);
     
 /*
  * fbseg.c

fb/fbscreen.c

@@ -241,14 +241,6 @@ fbFinishScreenInit(ScreenPtr	pScreen,
 	pScreen->ModifyPixmapHeader = fb24_32ModifyPixmapHeader;
 	pScreen->CreateScreenResources = fb24_32CreateScreenResources;
     }
-#endif
-#if 0
-    /* leave backing store initialization to the enclosing code so
-     * it can choose the correct order of wrappers
-     */
-    /* init backing store here so we can overwrite CloseScreen without stepping
-     * on the backing store wrapped version */
-    fbInitializeBackingStore (pScreen);
 #endif
     return TRUE;
 }