loongson/pypi: links for libsff

loongson/mirror libsff-0.1.3.tar.gz
loongson/mirror libsff-0.1.3-py3-none-any.whl
loongson/mirror libsff-0.1.2.tar.gz
loongson/mirror libsff-0.1.1.tar.gz
loongson/mirror libsff-0.1.0.tar.gz