unix: add IoctlCtlInfo on darwin

For golang/go#41868

Change-Id: I0f4dbeacfe10b9614caf05633a1de3a98a1fc85f
Reviewed-on: https://go-review.googlesource.com/c/sys/+/262959
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
diff --git a/unix/ztypes_darwin_arm64.go b/unix/ztypes_darwin_arm64.go
index ff43738..5eff2c1 100644
--- a/unix/ztypes_darwin_arm64.go
+++ b/unix/ztypes_darwin_arm64.go
@@ -503,3 +503,8 @@
 	Stathz  int32
 	Profhz  int32
 }
+
+type CtlInfo struct {
+	Id   uint32
+	Name [96]byte
+}