tor: fix duped stable block

Formula/tor.rb

@@ -28,21 +28,6 @@ class Tor < Formula
     sha256 "64564813dde75909e57a7a3790694022168104a9c29423822f503c54347c1fa1" => :mavericks
   end
 
-  stable do
-    # autotools only needed as long as the patch below is applied;
-    # remove them when the patch goes away
-    depends_on "autoconf" => :build
-    depends_on "automake" => :build
-
-    # Fixes build on 10.12
-    # https://trac.torproject.org/projects/tor/ticket/17819
-    # Applied upstream, will be in the next release.
-    patch do
-      url "https://trac.torproject.org/projects/tor/raw-attachment/ticket/17819/pthread.diff"
-      sha256 "9eb64548f0c1efae28535dcfa4ed19824eccaea1cee62607adb480b99217697b"
-    end
-  end
-
   devel do
     url "https://dist.torproject.org/tor-0.2.8.4-rc.tar.gz"
     mirror "https://tor.eff.org/dist/tor-0.2.8.4-rc.tar.gz"