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/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;
 }