Add __vfscanf_internal and __vfwscanf_internal with flags arguments.

There are two flags currently defined: SCANF_LDBL_IS_DBL is the mode
used by __nldbl_ scanf variants, and SCANF_ISOC99_A is the mode used
by __isoc99_ scanf variants.  In this patch, the new functions honor
these flag bits if they're set, but they still also look at the
corresponding bits of environmental state, and callers all pass zero.

The new functions do *not* have the "errp" argument possessed by
_IO_vfscanf and _IO_vfwscanf.  All internal callers passed NULL for
that argument.  External callers could theoretically exist, so I
preserved wrappers, but they are flagged as compat symbols and they
don't preserve the three-way distinction among types of errors that
was formerly exposed.  These functions probably should have been in
the list of deprecated _IO_ symbols in 2.27 NEWS -- they're not just
aliases for vfscanf and vfwscanf.

(It was necessary to introduce ldbl_compat_symbol for _IO_vfscanf.
Please check that part of the patch very carefully, I am still not
confident I understand all of the details of ldbl-opt.)

This patch also introduces helper inlines in libio/strfile.h that
encapsulate the process of initializing an _IO_strfile object for
reading.  This allows us to call __vfscanf_internal directly from
sscanf, and __vfwscanf_internal directly from swscanf, without
duplicating the initialization code.  (Previously, they called their
v-counterparts, but that won't work if we want to control *both* C99
mode and ldbl-is-dbl mode using the flags argument to
__vfscanf_internal.)  It's still a little awkward, especially for wide
strfiles, but it's much better than what we had.

	* libio/libioP.h (SCANF_LDBL_IS_DBL, SCANF_ISOC99_A): New constants.
	(__vfscanf_internal, __vfwscanf_internal): New function prototypes.
        * libio/libio.h: Remove libc_hidden_proto for _IO_vfscanf.
	* libio/strfile.h: Add multiple inclusion guard.
	(_IO_strfile_read, _IO_strfile_readw): New inline functions.

	* sysdeps/generic/math_ldbl_opt.h: Include shlib-compat.h, for
	consistency with the other version of this file.
	(ldbl_compat_symbol): New macro.
	* sysdeps/ieee754/ldbl-opt/math_ldbl_opt.h (ldbl_compat_symbol):
	New macro.

	* stdio-common/vfscanf-internal.c: Rename from vfscanf.c.
	Define __vfscanf_internal or __vfwscanf_internal, depending on
	COMPILE_WPRINTF; don't define any other public symbols.
	Temporarily check __ldbl_is_dbl and _IO_FLAGS2_SCANF_STD as well
	as the mode_flags argument.
	(encode_error, conv_error, input_error): Don't set errval.
	* stdio-common/vfwscanf-internal.c: Rename from vfwscanf.c.
	Include vfscanf-internal.c.
	* stdio-common/vfscanf.c, stdio-common/vfwscanf.c: New files
	defining the public entry points vfscanf and vfwscanf respectively.
	* stdio-common/iovfscanf.c, stdio-common/iovfwscanf.c: New files
	defining the compat symbols _IO_vfscanf and _IO_vfwscanf respectively.
	* stdio-common/Makefile (routines): Add vfscanf-internal,
	vfwscanf-internal, iovfscanf, iovfwscanf.
        * stdio-common/Versions: Mention GLIBC_2.28, so that
        it can be used in SHLIB_COMPAT expressions.
	* sysdeps/ieee754/ldbl-opt/nldbl-compat.c (__nldbl__IO_vfscanf):
	Wrap definition and compat_symbol line in #if SHLIB_COMPAT.

	* libio/iovsscanf.c, libio/vscanf.c, libio/vwscanf.c, libio/wscanf.c
	* libio/iovswscanf.c, stdio-common/isoc99_fscanf.c
	* stdio-common/isoc99_scanf.c, stdio-common/isoc99_vfscanf.c
	* stdio-common/isoc99_vscanf.c, stdio-common/isoc99_vsscanf.c
	* stdio-common/scanf.c, sysdeps/ieee754/ldbl-opt/nldbl-compat.c
	* wcsmbs/isoc99_fwscanf.c, wcsmbs/isoc99_vfwscanf.c
	* wcsmbs/isoc99_vswscanf.c, wcsmbs/isoc99_vwscanf.c
	* wcsmbs/isoc99_wscanf.c: Use __vfscanf_internal instead of
	_IO_vfscanf, and/or __vfwscanf_internal instead of _IO_vfwscanf.

	* libio/iovsscanf.c, stdio-common/isoc99_vsscanf.c:
	Use _IO_strfile_read.  Clean up includes.
	* stdio-common/sscanf.c, stdio-common/isoc99_sscanf.c:
	Use _IO_strfile_read to set up a FILE, and then call
	__vfwcanf_internal directly.  Clean up includes.

	* libio/iovswscanf.c, wcsmbs/isoc99_vswscanf.c:
	Use _IO_strfile_readw.  Clean up includes.
	* libio/swscanf.c, wcsmbs/isoc99_swscanf.c:
	Use _IO_strfile_readw to set up a FILE, and then call
	__vfwscanf_internal directly.  Clean up includes.

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