nds32: Use new common syscall() implementation

Traditionally nds32 has had a generic syscall implementation supporting
varargs.

During an audit it was found that this implementation seems to duplicate
the new common implementation and is no longer needed.

Signed-off-by: Stafford Horne <shorne@gmail.com>

libc/sysdeps/linux/nds32/Makefile.arch

@@ -1,7 +1,7 @@
 # Copyright (C) 2016 Andes Technology, Inc.
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 
-CSRC-y := brk.c prctl.c mremap.c syscall.c
-SSRC-y := setjmp.S __longjmp.S bsd-setjmp.S bsd-_setjmp.S clone.S vfork.S sysdep.S syscall.S
+CSRC-y := brk.c prctl.c mremap.c
+SSRC-y := setjmp.S __longjmp.S bsd-setjmp.S bsd-_setjmp.S clone.S vfork.S sysdep.S
 CSRC-$(UCLIBC_HAS_CONTEXT_FUNCS) += makecontext.c swapcontext.c
 SSRC-$(UCLIBC_HAS_CONTEXT_FUNCS) += getcontext.S setcontext.S

libc/sysdeps/linux/nds32/syscall.c

@@ -1,28 +0,0 @@
-/*
- *  Copyright (C) 2017 Andes Technology, Inc.
- *  Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
-
-#include <errno.h>
-#include <stdarg.h>
-#include <sys/syscall.h>
-#include <sysdep.h>
-#include <unistd.h>
-long int syscall (long int __sysno, ...)
-{
-
-	int result;
-	unsigned long arg1,arg2,arg3,arg4,arg5,arg6;
-	va_list arg;
-	va_start (arg, __sysno);
-	arg1 = va_arg (arg, unsigned long);
-	arg2 = va_arg (arg, unsigned long);
-	arg3 = va_arg (arg, unsigned long);
-	arg4 = va_arg (arg, unsigned long);
-	arg5 = va_arg (arg, unsigned long);
-	arg6 = va_arg (arg, unsigned long);
-	va_end (arg);
-        __asm__ volatile ( "" ::: "memory" );
-	result = INLINE_SYSCALL(syscall,7,__sysno,arg1,arg2,arg3,arg4,arg5,arg6);
-	return result;
-}