Tackle the endian.h mess. Make it so that:

Tackle the endian.h mess.  Make it so that:
 * you can #include <sys/endian.h> instead of <machine/endian.h>,
   and ditto <endian.h>  (fixes code that pulls in <sys/endian.h> first)

 * those will always export the symbols that POSIX specified for
   <endian.h>, including the new {be,le}{16,32,64}toh() set.  c.f.
	http://austingroupbugs.net/view.php?id=162

   if __BSD_VISIBLE then you also get the symbols that our <machine/endian.h>
   currently exports (ntohs, NTOHS, dlg's bemtoh*, etc)

 * when doing POSIX compiles (not __BSD_VISIBLE), then <netinet/in.h> and
   <arpa/inet.h> will *stop* exporting the extra symbols like BYTE_ORDER
   and betoh*

ok deraadt@