audit: support the "standard" <asm-generic/unistd.h>

Many of the syscalls mentioned in the audit code are not present
for architectures that implement only the "standard" set of
Linux syscalls (e.g. openat, but not open, etc.).  This change
adds proper #ifdefs for all those syscalls.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

include/asm-generic/audit_change_attr.h

@@ -1,4 +1,6 @@
+#ifdef __NR_chmod
 __NR_chmod,
+#endif
 __NR_fchmod,
 #ifdef __NR_chown
 __NR_chown,
@@ -20,7 +22,9 @@ __NR_chown32,
 __NR_fchown32,
 __NR_lchown32,
 #endif
+#ifdef __NR_link
 __NR_link,
+#endif
 #ifdef __NR_linkat
 __NR_linkat,
 #endif