iodine: do not depend on tuntap for HEAD

see https://github.com/yarrick/iodine
On Mac OS X 10.6 and later, iodine supports the native utun devices
built into the OS - use -d utunX

Closes Homebrew/homebrew#47922.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/iodine.rb

@@ -1,12 +1,16 @@
 class Iodine < Formula
   desc "Tool for tunneling IPv4 data through a DNS server"
   homepage "http://code.kryo.se/iodine/"
-  url "http://code.kryo.se/iodine/iodine-0.7.0.tar.gz"
-  mirror "https://mirrors.kernel.org/debian/pool/main/i/iodine/iodine_0.7.0.orig.tar.gz"
-  sha256 "ad2b40acf1421316ec15800dcde0f587ab31d7d6f891fa8b9967c4ded93c013e"
-
   head "https://github.com/yarrick/iodine.git"
 
+  stable do
+    url "http://code.kryo.se/iodine/iodine-0.7.0.tar.gz"
+    mirror "https://mirrors.kernel.org/debian/pool/main/i/iodine/iodine_0.7.0.orig.tar.gz"
+    sha256 "ad2b40acf1421316ec15800dcde0f587ab31d7d6f891fa8b9967c4ded93c013e"
+
+    depends_on :tuntap
+  end
+
   bottle do
     cellar :any
     revision 1
@@ -14,8 +18,6 @@ class Iodine < Formula
     sha256 "371c3443aeebef21ec9ec072e2bcc472bd76d4909466744c66f67a9bbce5d41f" => :mountain_lion
   end
 
-  depends_on :tuntap
-
   def install
     system "make", "install", "prefix=#{prefix}"
   end