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/OpenGl/OpenGl_Context.cxx

@@ -497,7 +497,9 @@ Standard_Boolean OpenGl_Context::CheckExtension (const char* theExtName) const
 {
   if (theExtName  == NULL)
   {
+#ifdef OPENGL_DEB
     std::cerr << "CheckExtension called with NULL string!\n";
+#endif
     return Standard_False;
   }