Add framebuffer access wrapper infrastructure.

Create fbPrepareAccess macros to call into the driver to set up the
wfbReadMemory and wfbWriteWemory pointers.  Call these from fbGetDrawable and
fbGetStipDrawable.

Add the READ and WRITE macros, which expand to simple memory accesses for fb,
and calls through the function pointers for wfb.

Add fbFinishAccess macro to give the driver an opportunity to clean up.  Add
calls to this in the appropriate places.

fb/fballpriv.c

@@ -90,3 +90,8 @@ fbAllocatePrivates(ScreenPtr pScreen, int *pGCIndex)
 #endif
     return TRUE;
 }
+
+#ifdef FB_ACCESS_WRAPPER
+ReadMemoryProcPtr wfbReadMemory;
+WriteMemoryProcPtr wfbWriteMemory;
+#endif