Add missing splice syscall numbers for alpha and s390

All archs now verified as compiling.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/arch-s390.h b/arch/arch-s390.h
index dfb7899..0647750 100644
--- a/arch/arch-s390.h
+++ b/arch/arch-s390.h
@@ -12,6 +12,12 @@
 #define __NR_fadvise64		253
 #endif
 
+#ifndef __NR_sys_splice
+#define __NR_sys_splice		306
+#define __NR_sys_tee		308
+#define __NR_sys_vmsplice	309
+#endif
+
 #define nop		asm volatile ("diag 0,0,68" : : : "memory")
 #define read_barrier()	asm volatile("bcr 15,0" : : : "memory")
 #define write_barrier()	asm volatile("bcr 15,0" : : : "memory")