fix bundled dir check
fix bundled dir check

used `is`, which was wrong

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