alpha uses sysarch() to implement the floating-point control routines and 
mips64 uses sysarch() to implement cacheflush().  Let's provide 
lib/libc/hidden/machine/sysarch.h with the obvious contents so that those 
internal calls go directly to the syscall stub without possiblity of 
override or unnecessary relocations.

ok?

Philip Guenther

-----
/*      $OpenBSD$       */
/*
 * Copyright (c) 2016 Philip Guenther <[email protected]>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _LIBC_MACHINE_SYSARCH_H_
#define _LIBC_MACHINE_SYSARCH_H_

#include_next <machine/sysarch.h>

PROTO_NORMAL(sysarch);

#endif /* !_LIBC_MACHINE_SYSARCH_H_ */

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