loongson/pypi: links for poly2tri

loongson/mirror poly2tri-0.3.3.tar.gz
loongson/mirror poly2tri-0.3.2.tar.gz
loongson/mirror poly2tri-0.3.1.tar.gz
loongson/mirror poly2tri-0.3.tar.gz
loongson/mirror poly2tri-0.2.tar.gz