lndpriv/lndpriv: links for backports-socketpair

root/pypi backports.socketpair-3.5.0.4-py2.py3-none-any.whl
root/pypi backports.socketpair-3.5.0.3-py2.py3-none-any.whl
root/pypi backports.socketpair-3.5.0.2.zip