backing out jf's are_cree fix

Mesh/3D_Extrude.cpp

-// $Id: 3D_Extrude.cpp,v 1.18 2001-08-02 17:33:27 geuzaine Exp $
+// $Id: 3D_Extrude.cpp,v 1.19 2001-08-02 17:35:34 geuzaine Exp $
 
 #include "Gmsh.h"
 #include "Const.h"