loongson/pypi: links for pybind11-example

loongson/mirror pybind11_example-0.3.tar.gz
loongson/mirror pybind11_example-0.3-cp38-cp38-win_amd64.whl
loongson/mirror pybind11_example-0.3-cp37-cp37m-win_amd64.whl
loongson/mirror pybind11_example-0.3-cp37-cp37m-win32.whl
loongson/mirror pybind11_example-0.1.tar.gz
loongson/mirror pybind11_example-0.1-cp38-cp38-win_amd64.whl