loongson/pypi: links for six

loongson/pypi six-1.16.0-py2.py3-none-any.whl
loongson/pypi six-1.15.0-py2.py3-none-any.whl
loongson/pypi six-1.12.0-py2.py3-none-any.whl
loongson/pypi six-1.11.0-py2.py3-none-any.whl