More fallout from global.cc namespace changes

[Benjamin Kosnik]

> 2002-10-12  Danny Smith  <dannysmith@users.sourceforge.net> 
> 
> 	* include/bits/stl_threads.h (_GLIBCPP_mutex,
> 	_GLIBCPP_mutex_init,_GLIBCPP_mutex_address,
> 	_GLIBCPP_mutex_address_init, _GLIBCPP_once):
> 	Declare in namespace __gnu_cxx.
> 	(_STL_mutex_lock::_M_initialize): Qualify __gnu_cxx
> 	names.
> 	Bump copyright date.

This looks fine, please check it in.

-benjamin