or1k: Use new common syscall() implementation

Now that the common syscall implementation supports vararg calling
conventions we can safely use it on OpenRISC.

This saves a bit of code in the openrisc implementation.

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

libc/sysdeps/linux/or1k/Makefile.arch

@@ -5,5 +5,5 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
 
-CSRC-y := __syscall_error.c __init_brk.c brk.c sbrk.c clone.c syscall.c
+CSRC-y := __syscall_error.c __init_brk.c brk.c sbrk.c clone.c
 SSRC-y := __longjmp.S setjmp.S or1k_clone.S

libc/sysdeps/linux/or1k/syscall.c

@@ -1,32 +0,0 @@
-/*
- *  Copyright (C) 2017 Joel Stanley <joel@jms.id.au>
- *  Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
-
-#include <stdarg.h>
-#include <sys/syscall.h>
-#include <unistd.h>
-
-long int syscall (long num, ...)
-{
-	unsigned long arg1 = 0;
-	unsigned long arg2 = 0;
-	unsigned long arg3 = 0;
-	unsigned long arg4 = 0;
-	unsigned long arg5 = 0;
-	unsigned long arg6 = 0;
-	va_list arg;
-
-	va_start (arg, num);
-	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" );
-
-	return INLINE_SYSCALL_NCS(num, 6, arg1, arg2, arg3, arg4, arg5, arg6);
-}