loongson/pypi: links for tessbkgd

loongson/mirror tessbkgd-0.2.1.tar.gz
loongson/mirror tessbkgd-0.2.1-py3-none-any.whl
loongson/mirror tessbkgd-0.2.tar.gz
loongson/mirror tessbkgd-0.2-py3.8.egg
loongson/mirror tessbkgd-0.2-py3-none-any.whl