loongson/pypi: links for n-ext

loongson/mirror n-ext-2021.3.2.tar.gz
loongson/mirror n_ext-2021.3.2-py3-none-any.whl
loongson/mirror n-ext-2021.3.1.tar.gz
loongson/mirror n_ext-2021.3.1-py3-none-any.whl
loongson/mirror n-ext-2021.3.tar.gz
loongson/mirror n_ext-2021.3-py3-none-any.whl
loongson/mirror n-ext-2021.1.tar.gz
loongson/mirror n_ext-2021.1-py3-none-any.whl