fetch_libzmq always downloads fresh libzmq
fetch_libzmq always downloads fresh libzmq

Forces a fresh download, which allows `./configure` to run.

Useful on platforms where the shipped platform.hpp does not work, but bundled libzmq is still necessary.

To use it:

pip install pyzmq --global-option="fetch_libzmq"
caidongyun/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,swn1/pyzmq,yyt030/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,swn1/pyzmq,caidongyun/pyzmq,swn1/pyzmq,caidongyun/pyzmq,dash-dash/pyzmq,yyt030/pyzmq