loongson/pypi: links for blockdiagcontrib-square

loongson/mirror blockdiagcontrib-square-0.1.3.tar.gz
loongson/mirror blockdiagcontrib-square-0.1.2.tar.gz
loongson/mirror blockdiagcontrib-square-0.1.1.tar.gz
loongson/mirror blockdiagcontrib-square-0.1.0.tar.gz