Fix. Detection `zmq_ctx_shutdown` function.
Fix. Detection `zmq_ctx_shutdown` function.

LuaDist/lzmq,zeromq/lzmq,zeromq/lzmq,LuaDist/lzmq,bsn069/lzmq,moteus/lzmq,moteus/lzmq,LuaDist/lzmq-ffi,moteus/lzmq,zeromq/lzmq,LuaDist/lzmq-ffi,bsn069/lzmq