hashtable_policy.h: Correct namepace nesting for _Hashtable forward declaration.

2012-05-02  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/hashtable_policy.h: Correct namepace nesting for
	_Hashtable forward declaration.

From-SVN: r187052

libstdc++-v3/ChangeLog

+2012-05-02  Benjamin Kosnik  <bkoz@redhat.com>
+
+	* include/bits/hashtable_policy.h: Correct namepace nesting for
+	_Hashtable forward declaration.
+
 2012-05-01  François Dumont  <fdumont@gcc.gnu.org>
 
 	PR libstdc++/53115

libstdc++-v3/include/bits/hashtable_policy.h

@@ -33,12 +33,16 @@
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
   template<typename _Key, typename _Value, typename _Alloc,
 	   typename _ExtractKey, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash,
 	   typename _RehashPolicy, typename _Traits>
     class _Hashtable;
 
+_GLIBCXX_END_NAMESPACE_VERSION
+
 namespace __detail
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION