Remove architecture specific shmat.S files.

These files are identical to the generated system calls.
In the case of MIPS, the file was already disconnected from the build.

Submitted by:	Ali Mashtizadeh <ali@mashtizadeh.com>
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D14976

lib/libc/aarch64/sys/Makefile.inc

@@ -5,7 +5,6 @@ MIASM:=	${MIASM:Nfreebsd[467]_*}
 SRCS+=	__vdso_gettc.c
 
 MDASM=	cerror.S \
-	shmat.S \
 	syscall.S \
 	vfork.S
 

lib/libc/aarch64/sys/shmat.S

@@ -1,35 +0,0 @@
-/*-
- * Copyright (c) 2014 The FreeBSD Foundation
- * All rights reserved.
- *
- * This software was developed by Andrew Turner under
- * sponsorship from the FreeBSD Foundation.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <machine/asm.h>
-__FBSDID("$FreeBSD$");
-
-#include "SYS.h"
-
-RSYSCALL(shmat)

lib/libc/arm/sys/Makefile.inc

@@ -2,7 +2,7 @@
 
 SRCS+=	__vdso_gettc.c
 
-MDASM= Ovfork.S brk.S cerror.S sbrk.S shmat.S syscall.S
+MDASM= Ovfork.S brk.S cerror.S sbrk.S syscall.S
 
 # Don't generate default code for these syscalls:
 NOASM+=	vfork.o

lib/libc/arm/sys/shmat.S

@@ -1,9 +0,0 @@
-/*	$NetBSD: shmat.S,v 1.1 2000/12/29 20:14:04 bjh21 Exp $	*/
-
-#include <machine/asm.h>
-__FBSDID("$FreeBSD$");
-#include "SYS.h"
-
-RSYSCALL(shmat)
-
-	.section .note.GNU-stack,"",%progbits

lib/libc/mips/sys/shmat.S

@@ -1,7 +0,0 @@
-/*	$NetBSD: shmat.S,v 1.1 2000/07/07 08:20:52 itohy Exp $	*/
-
-#include <machine/asm.h>
-__FBSDID("$FreeBSD$");
-#include "SYS.h"
-
-RSYSCALL(shmat)

lib/libc/riscv/sys/Makefile.inc

@@ -2,9 +2,7 @@
 
 SRCS+=	trivial-vdso_tc.c
 
-#MDASM= ptrace.S
 MDASM=	cerror.S \
-	shmat.S \
 	syscall.S \
 	vfork.S
 

lib/libc/riscv/sys/shmat.S

@@ -1,40 +0,0 @@
-/*-
- * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
- * All rights reserved.
- *
- * Portions of this software were developed by SRI International and the
- * University of Cambridge Computer Laboratory under DARPA/AFRL contract
- * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
- *
- * Portions of this software were developed by the University of Cambridge
- * Computer Laboratory as part of the CTSRD Project, with support from the
- * UK Higher Education Innovation Fund (HEIF).
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <machine/asm.h>
-__FBSDID("$FreeBSD$");
-
-#include "SYS.h"
-
-RSYSCALL(shmat)