fixed gnu warning

src/ca/CASG.cpp

@@ -26,6 +26,8 @@
 #include "cac.h"
 #include "sgAutoPtr.h"
 
+casgRecycle::~casgRecycle () {}
+
 CASG::CASG ( ca_client_context &cacIn ) :
     client ( cacIn ), magic ( CASG_MAGIC )
 {

src/ca/syncGroup.h

@@ -54,6 +54,8 @@ class casgRecycle {             // X aCC 655
 public:
     virtual void recycleSyncGroupWriteNotify ( class syncGroupWriteNotify & io ) = 0;
     virtual void recycleSyncGroupReadNotify ( class syncGroupReadNotify & io ) = 0;
+protected:
+    virtual ~casgRecycle ();
 };
 
 class syncGroupNotify : public tsDLNode < syncGroupNotify > {