Always say "private noncopyable" to avoid warnings.

[SVN r12762]

base_from_member_test.cpp

@@ -57,7 +57,7 @@ struct object_id_compare
 // A singleton of this type coordinates the acknowledgements
 // of objects being created and used.
 class object_registrar
-    : boost::noncopyable
+    : private boost::noncopyable
 {
 public:
 

noncopyable_test.cpp

@@ -20,7 +20,7 @@
 
 namespace
 {
-    class DontTreadOnMe : boost::noncopyable
+    class DontTreadOnMe : private boost::noncopyable
     {
     public:
          DontTreadOnMe() { std::cout << "defanged!" << std::endl; }