loongson/pypi: links for buildstrap

loongson/mirror buildstrap-0.4.0.tar.gz
loongson/mirror buildstrap-0.4.0-py3.5.egg
loongson/mirror buildstrap-0.4.0-py3-none-any.whl
loongson/mirror buildstrap-0.3.0.tar.gz
loongson/mirror buildstrap-0.3.0-py3.5.egg
loongson/mirror buildstrap-0.2.0.tar.gz
loongson/mirror buildstrap-0.2.0-py3-none-any.whl
loongson/mirror buildstrap-0.1.0.tar.gz
loongson/mirror buildstrap-0.1.0-py3-none-any.whl