_endian.h: Include sys/ctypes.h for visibility macrosHEADmain

BYTE_ORDER, LITTLE_ENDIAN and BIG_ENDIAN will be required by the
forthcoming POSIX Issue 8. In addition, they are provided in the BSD
compilation environments. However, depending on the order includes
happend, sys/cdefs.h may or may not be included when endian.h is
included. Include it here so we can safely test __BSD_VISIBLE.  Add
visibility when we're compiling in the future for issue 8, but since the
date number for issue 8 hasn't been fixed, use strictly greater than the
issue 7 date.of 200809.

This had the side effect of sometimes (in the traditional BSD
compliation environment)
 #if BYTE_ORDER == LITTLE_ENDIAN
and
 #if BYTE_ORDER == BIG_ENDIAN
both being true because none of these were defined. This fixes
that. It also fixes including it after <stdio.h> but not before.

PR:			269249
MFC After:		1d (build related)
Reviewed by:		kib, emaste
Differential Revision:	https://reviews.freebsd.org/D39176

Sponsored by:		Netflix

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