0025266: Debug statements in the source are getting flushed on to the console

Output to cout activated previously in Debug mode by #ifdef DEB is suppressed by using macro <PACKAGE>_DEB instead of DEB

src/BSplCLib/BSplCLib.cxx

@@ -3481,7 +3481,7 @@ void  BSplCLib::TangExtendToConstraint
  Standard_Real&                        KnotsResult, 
  Standard_Real&                        PolesResult) 
 {
-#if DEB
+#if BSPLCLIB_DEB
   if (CDegree<Continuity+1) {
     cout<<"The BSpline degree must be greater than the order of continuity"<<endl;
   }