libio patches for glibc 2.1

[Jeffrey A Law]

  In message < vyzg1lask1j.fsf@issan.informatik.uni-dortmund.de >you write:
  > This patch fixes some problems in libio in connection with glibc 2.1.
  > Note that the change of _IO_wchar_t is a binary incompatibility, so users
  > of glibc 2.1 snapshots need to recompile at least all code that uses
  > [io]fstream.
  > 
  > 
  > 1998-02-22  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
  > 
  > 	Changes for _G_IO_IO_FILE_VERSION == 0x20001:
  > 	* 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.
Normally I'd ask you to install these patches, but I already had the
patchkit handy from installing it on the release branch.  So I went
ahead and too care of it myself.

Thanks!
jeff