avoid useless vc++ warning

src/db/dbServiceIO.cpp

@@ -33,9 +33,18 @@
 #include "dbChannelIOIL.h"
 #include "dbPutNotifyBlocker.h"
 
+#ifdef _MSC_VER
+#   pragma warning ( push )
+#   pragma warning ( disable:4660 )
+#endif
+
 template class resTable < dbBaseIO, chronIntId >;
 template class chronIntIdResTable < dbBaseIO >;
 
+#ifdef _MSC_VER
+#   pragma warning ( pop )
+#endif
+
 class dbServiceIOLoadTimeInit {
 public:
     dbServiceIOLoadTimeInit ();