Make zero copying a define flag; add omitted definition.
Make zero copying a define flag; add omitted definition.

lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,interpretor/zeromq.js,interpretor/zeromq.js,lgeiger/zmq-prebuilt,interpretor/zeromq.js,lgeiger/zmq-prebuilt,interpretor/zeromq.js,interpretor/zeromq.js