Add RRInit function to create resource types for RR objects.

To allow RandR objects to be created before the screen object exists,
the resource types must be registered with the resource database.
A driver wishing to create RandR objects must call RRInit before doing so.

Also, fix a segfault when setting Output data before it is associated with a
screen.

randr/randr.c

@@ -39,8 +39,7 @@
 #endif
 
 #define RR_VALIDATE
-int	RRGeneration;
-int	RRNScreens;
+static int	RRNScreens;
 
 #define wrap(priv,real,mem,func) {\
     priv->mem = real->mem; \
@@ -198,10 +197,10 @@ SRRNotifyEvent (xEvent *from,
     }
 }
 
-Bool RRScreenInit(ScreenPtr pScreen)
-{
-    rrScrPrivPtr   pScrPriv;
+static int RRGeneration;
 
+Bool RRInit (void)
+{
     if (RRGeneration != serverGeneration)
     {
 	if (!RRModeInit ())
@@ -210,9 +209,25 @@ Bool RRScreenInit(ScreenPtr pScreen)
 	    return FALSE;
 	if (!RROutputInit ())
 	    return FALSE;
+	RRGeneration = serverGeneration;
+    }
+    return TRUE;
+}
+
+static int RRScreenGeneration;
+
+Bool RRScreenInit(ScreenPtr pScreen)
+{
+    rrScrPrivPtr   pScrPriv;
+
+    if (!RRInit ())
+	return FALSE;
+
+    if (RRScreenGeneration != serverGeneration)
+    {
 	if ((rrPrivIndex = AllocateScreenPrivateIndex()) < 0)
 	    return FALSE;
-	RRGeneration = serverGeneration;
+	RRScreenGeneration = serverGeneration;
     }
 
     pScrPriv = (rrScrPrivPtr) xalloc (sizeof (rrScrPrivRec));