* 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.
	Adjust copyright.

From-SVN: r58092