Gihan Munasinghe

When try to build from the latest master getting the following error ``` Curve.cpp:34:55: error: 'zmq_curve_keypair' was not declared in this scope int rc = zmq_curve_keypair (public_key, secret_key); ^ Curve.cpp:...

Hi I am very new to golang. So don't know if I have done something fundamentally wrong or utter useless change with this patch I have made the sys logging...