Minimize use of _IO_ and _G_ symbols in public headers.

This is groundwork for removing the inclusion of (bits/)libio.h from
stdio.h.  It doesn't make a whole lot of sense by itself, but it is
also much more mechanical than the next piece, which involves moving
the definition of struct _IO_FILE.

	* libio/bits/types/__fpos64_t.h, libio/bits/types/__fpos_t.h
	* libio/bits/types/cookie_io_functions_t.h: New single-type headers.
	* include/bits/types/__fpos64_t.h, include/bits/types/__fpos_t.h
	* include/bits/types/cookie_io_functions_t.h: New wrappers.
	* libio/Makefile: Install the new headers.

	* libio/stdio.h: Get __gnuc_va_list directly from stdarg.h.
	Get __fpos_t, __fpos64_t, and cookie_io_functions_t from the new
	headers.  Don't use _G_ names when defining va_list, fpos_t, or
	fpos64_t.  Define BUFSIZ unconditionally as 8192, and EOF
	unconditionally as (-1).  Declare stdin, stdout, and stderr with
	type FILE.  Use cookie_io_functions_t instead of
	_IO_cookie_io_functions_t, __gnuc_va_list instead of _G_va_list,
	and __ssize_t instead of _IO_ssize_t.  Move getc and putc macros
	and inclusion of bits/libio.h to bottom of file.

	* libio/bits/stdio.h, libio/bits/stdio2.h: Use __ssize_t instead
	of _IO_ssize_t, and __gnuc_va_list instead of _G_va_list.

	* bits/_G_config.h, sysdeps/unix/sysv/linux/_G_config.h: Get
	definitions of __fpos_t and __fpos64_t from the new headers.
	Define _G_fpos_t as __fpos_t and _G_fpos64_t as __fpos64_t.

	* libio/bits/libio.h: Include stdio.h and don't repeat anything
	that it does.  Define _IO_BUFSIZ as BUFSIZ, _IO_fpos_t as
	__fpos_t, _IO_fpos64_t as __fpos64_t, _IO_va_list as __gnuc_va_list,
	__io_read_fn as cookie_read_fn_t, __io_write_fn as cookie_write_fn_t,
	__io_seek_fn as cookie_seek_fn_t, __io_close_fn as cookie_close_fn_t,
	and _IO_cookie_io_functions_t as cookie_io_functions_t.

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