x/sys/unix: regenerate darwin/arm64 outputs with the latest SDK

I did this on OS X 10.10.5 (14F27) using the iOS SDK included in Xcode
6.4 (6E35b). This commit contains the same SYS_SYSCTL -> SYS___SYSCTL
workaround found in commit 9ef4b6c; see its description for more info.

Change-Id: I4dddc2a6d030ce297ee711f4430ec9db3abcda50
Reviewed-on: https://go-review.googlesource.com/14094
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
diff --git a/unix/ztypes_darwin_arm64.go b/unix/ztypes_darwin_arm64.go
index 7329d07..85d56ea 100644
--- a/unix/ztypes_darwin_arm64.go
+++ b/unix/ztypes_darwin_arm64.go
@@ -1,8 +1,7 @@
+// +build arm64,darwin
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_darwin.go
 
-// +build arm64,darwin
-
 package unix
 
 const (
@@ -132,9 +131,9 @@
 }
 
 type Log2phys_t struct {
-	Flags       uint32
-	Contigbytes int64
-	Devoffset   int64
+	Flags     uint32
+	Pad_cgo_0 [8]byte
+	Pad_cgo_1 [8]byte
 }
 
 type Fsid struct {