Add __vsyslog_internal, with same flags as __v*printf_internal.

__nldbl___vsyslog_chk will ultimately want to pass PRINTF_LDBL_IS_DBL
down to __vfprintf_internal *as well as* possibly setting PRINTF_FORTIFY.
To make that possible, we need a __vsyslog_internal that takes the
same flags as printf.  The code in misc/syslog.c does also get a
little simpler.

	* misc/syslog.c: Include libioP.h, not iolibio.h.
	(__vsyslog_internal): New function with the former body of
	__vsyslog_chk; takes mode_flags argument same as
	__v*printf_internal.  Call __vfprintf_internal directly.

	(__vsyslog_chk): Now a wrapper around __vsyslog_internal.
	Remove libc_hidden_def.
	(__syslog, __syslog_chk): Use __vsyslog_internal.
	(__vsyslog): Move to just below __syslog.  Use __vsyslog_internal.

	* include/sys/syslog.h: Add multiple inclusion guard.
	Add prototype for __vsyslog_internal.
	Remove libc_hidden_proto for __vsyslog_chk.

	* sysdeps/ieee754/ldbl-opt/nldbl-compat.c (__nldbl___vsyslog_chk):
	Use __vsyslog_internal.

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