return the version string of the system zmq library
zmq.version()
a string of the following format: major.minor.patch
http://www.zeromq.org http://api.zeromq.org http://zguide.zeromq.org/page:all
connect.socket,bind.socket,receive.socket,send.socket
# NOT RUN { library(rzmq) zmq.version() # }
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