libstdc++-v3: Recent locale/ctype changes break NetBSD

[Benjamin Kosnik]

Ack. Paolo, this is correct but I checked it in before I read this list. 

-benjamin

>    ctype<char>::ctype(const mask* __table, bool __del, size_t __refs)
>    : __ctype_abstract_base<char>(__refs), _M_del(__table != 0 && __del),
> -  _M_toupper(NULL), _M_tolower(NULL),
>    _M_toupper(NULL), _M_tolower(NULL), _M_table(__table ? __table : _ctype_ + 1)
> 
>    { }