Steal Xinerama code from SiS driver. Add missing files.

Provide a Xinerama implementation when DIX version isn't enabled. This
version exposes each crtc as a separate 'screen' and reports the size of
that patch. The extension also sends ConfigureNotify events to the root
window whenever crtcs change so that applications will re-fetch xinerama
information. This actually works for metacity.

randr/randrstr.h

@@ -304,6 +304,12 @@ RRScreenSizeSet (ScreenPtr  pScreen,
 		 CARD32	    mmWidth,
 		 CARD32	    mmHeight);
 
+/*
+ * Send ConfigureNotify event to root window when 'something' happens
+ */
+void
+RRSendConfigNotify (ScreenPtr pScreen);
+    
 /*
  * screen dispatch
  */
@@ -629,4 +635,8 @@ ProcRRListOutputProperties (ClientPtr client);
 int
 ProcRRDeleteOutputProperty (ClientPtr client);
 
+/* rrxinerama.c */
+void
+RRXineramaExtensionInit(void);
+
 #endif /* _RANDRSTR_H_ */