loongson/pypi: links for itertoolz

loongson/mirror itertoolz-0.5.tar.gz
loongson/mirror itertoolz-0.4.tar.gz
loongson/mirror itertoolz-0.3.tar.gz
loongson/mirror itertoolz-0.2.tar.gz
loongson/mirror itertoolz-0.1.tar.gz