* libioP.h (_IO_showmanyc_t, _IO_SHOWMANYC, _IO_imbue_t,
	_IO_IMBUE): New definitions.
	(struct _IO_jump_t): Add __showmanyc and __imbue fields.
	(_IO_file_fopen): Add new fourth argument.
	* filebuf.cc (filebuf::open): Pass new fourth argument to
	_IO_file_fopen.
	* iolibio.h (_IO_freopen): Likewise.
	* streambuf.cc (streambuf::showmanyc, streambuf::imbue): New
	functions.
	* streambuf.h (_IO_wchar_t): Define to _G_wchar_t.
	(ios::fill): Remove casts.
	(struct streambuf): Add showmanyc and imbue members.
	* iostream.cc (ostream::operator<<(double n)) [__GLIBC_MINOR__ >=
	1]: Initialize new fields is_char of struct printf_info.
	(ostream::operator<<(long double n)) [__GLIBC_MINOR__ >= 1]:
	Likewise.

From-SVN: r18222