Fix _Hashtable extension

[François Dumont]

Hi

     Here is a patch to fix _Hashtable Standard extension type which is 
almost unusable at the moment if instantiated with anything else that 
the types used for the std unordered containers that is to say 
__detail::_Default_ranged_hash and __detail::_Mod_range_hashing.

     It is a really safe patch so I would propose it for current trunk 
but at the same time it only impacts a Standard extension and it hasn't 
been reported by anyone so just tell me when to apply it.

2014-03-21  François Dumont <fdumont@gcc.gnu.org>

     * include/bits/hashtable.h (_Hashtable(allocator_type)): Fix call
     to delegated constructor.
     (_Hashtable(size_type, _H1, key_equal, allocator_type)): Likewise.
     (_Hashtable<_It>(_It, _It, size_type, _H1, key_equal, allocator_type)):
     Likewise.
     (_Hashtable(
     initializer_list, size_type, _H1, key_equal, allocator_type)): 
Likewise.

Tested under Linux x86_64.

François

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