ZeroMQ binding in Mozart/Oz 1.4.

1. Install ZeroMQ. Only 2.2, 3.1.0 and 3.1.1 are currently supported. Make sure it is installed as a 32-bit library.

   # Debian/Ubuntu 32-bit
   apt-get install libzmq-dev
   
   # Arch Linux 32-bit
   pacman -S zeromq        # 2.2
   packer -S zeromq-dev    # 3.1.0
   
   # Arch Linux 64-bit
   packer -S lib32-zeromq      # 2.2
   packer -S lib32-zeromq-dev  # 3.1.0
   packer -S lib32-zeromq-git  # 3.1.1 (git master)

2. Run ozmake.

3. Check the samples/ directory to see some sample code.