zeromq: apply patch for strndup on 10.6

Fixes Homebrew/homebrew#19877.

Formula/zeromq.rb

@@ -7,6 +7,9 @@ class Zeromq < Formula
 
   head 'https://github.com/zeromq/libzmq.git'
 
+  option :universal
+  option 'with-pgm', 'Build with PGM extension'
+
   depends_on 'pkg-config' => :build
   depends_on 'libpgm' if build.include? 'with-pgm'
 
@@ -20,8 +23,9 @@ class Zeromq < Formula
     cause "Segfault while linking"
   end
 
-  option :universal
-  option 'with-pgm', 'Build with PGM extension'
+  # Address lack of strndup on 10.6, fixed upstream
+  # https://github.com/zeromq/zeromq3-x/commit/400cbc208a768c4df5039f401dd2688eede6e1ca
+  def patches; DATA; end
 
   def install
     ENV.universal_binary if build.universal?
@@ -44,10 +48,48 @@ class Zeromq < Formula
     To install the zmq gem on 10.6 with the system Ruby on a 64-bit machine,
     you may need to do:
 
-        ARCHFLAGS="-arch x86_64" gem install zmq -- --with-zmq-dir=#{HOMEBREW_PREFIX}
+        ARCHFLAGS="-arch x86_64" gem install zmq -- --with-zmq-dir=#{opt_prefix}
 
     If you want to build the Java bindings from https://github.com/zeromq/jzmq
     you will need the Java Developer Package from http://connect.apple.com/
     EOS
   end
 end
+
+__END__
+diff --git a/tests/test_disconnect_inproc.cpp b/tests/test_disconnect_inproc.cpp
+index 7875083..d6b68c6 100644
+--- a/tests/test_disconnect_inproc.cpp
++++ b/tests/test_disconnect_inproc.cpp
+@@ -40,16 +40,14 @@ int main(int argc, char** argv) {
+                 zmq_msg_t msg;
+                 zmq_msg_init (&msg);
+                 zmq_msg_recv (&msg, pubSocket, 0);
+-                int msgSize = zmq_msg_size(&msg);
+                 char* buffer = (char*)zmq_msg_data(&msg);
+ 
+                 if (buffer[0] == 0) {
+                     assert(isSubscribed);
+-                    printf("unsubscribing from '%s'\n", strndup(buffer + 1, msgSize - 1));
+                     isSubscribed = false;
+-                } else {
++                } 
++                else {
+                     assert(!isSubscribed);
+-                    printf("subscribing on '%s'\n", strndup(buffer + 1, msgSize - 1));
+                     isSubscribed = true;
+                 }
+ 
+@@ -66,11 +64,6 @@ int main(int argc, char** argv) {
+                 zmq_msg_t msg;
+                 zmq_msg_init (&msg);
+                 zmq_msg_recv (&msg, subSocket, 0);
+-                int msgSize = zmq_msg_size(&msg);
+-                char* buffer = (char*)zmq_msg_data(&msg);
+-        
+-                printf("received on subscriber '%s'\n", strndup(buffer, msgSize));
+-        
+                 zmq_getsockopt (subSocket, ZMQ_RCVMORE, &more, &more_size);
+                 zmq_msg_close (&msg);
+         
+