add note about ldconfig on failed zmq detection
add note about ldconfig on failed zmq detection

swn1/pyzmq,Mustard-Systems-Ltd/pyzmq,Mustard-Systems-Ltd/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,caidongyun/pyzmq,yyt030/pyzmq,yyt030/pyzmq,swn1/pyzmq,caidongyun/pyzmq,caidongyun/pyzmq,ArvinPan/pyzmq,ArvinPan/pyzmq