always define __IPC_64 regardless of __NR_ipc

libc/misc/sysvipc/ipc.h

@@ -2,10 +2,10 @@
 #define IPC_H
 #include <syscall.h>
 
-#ifdef __NR_ipc
-
 #define __IPC_64	0x100
 
+#ifdef __NR_ipc
+
 /* The actual system call: all functions are multiplexed by this.  */
 extern int __syscall_ipc __P((int __call, int __first, int __second,
 					  int __third, void *__ptr));