loongson/mirror: links for purl2src

loongson/mirror purl2src-1.2.4.tar.gz
loongson/mirror purl2src-1.2.4-py3-none-any.whl
loongson/mirror purl2src-1.2.3.tar.gz
loongson/mirror purl2src-1.2.3-py3-none-any.whl