Fix clang compile error

Author: Buggynours

storage/connect/value.h

@@ -412,6 +412,7 @@ class DllExport DTVAL : public TYPVAL<int> {
   // Constructors
   DTVAL(PGLOBAL g, int n, int p, PCSZ fmt);
   DTVAL(int n);
+  using TYPVAL::SetValue;
 
   // Implementation
   virtual bool   SetValue_pval(PVAL valp, bool chktype);