added missing forward ref (fixed gcc 4.0 issue)

src/cas/generic/casdef.h

@@ -510,7 +510,7 @@ public:
     void destroyRequest ();
     
 private:
-    casPVI * pPVI;
+    class casPVI * pPVI;
     casPV & operator = ( const casPV & );
 
     friend class casStrmClient;

src/cas/generic/ioBlocked.h

@@ -37,7 +37,7 @@ public:
 	ioBlocked ();
 	virtual ~ioBlocked ();
 private:
-	ioBlockedList * pList;
+	class ioBlockedList * pList;
 	virtual void ioBlockedSignal ();
 };