loongson/pypi: links for pydot-ng

loongson/mirror pydot_ng-2.0.0.tar.gz
loongson/mirror pydot_ng-2.0.0-py2.py3-none-any.whl
loongson/mirror pydot_ng-1.0.0.zip
loongson/mirror pydot_ng-1.0.0.tar.gz