loongson/pypi: links for sieve-sift

loongson/mirror sieve-sift-0.1.6.tar.gz
loongson/mirror sieve-sift-0.1.5.tar.gz
loongson/mirror sieve-sift-0.1.4.tar.gz
loongson/mirror sieve-sift-0.1.3.1.tar.gz
loongson/mirror sieve-sift-0.1.3.tar.gz
loongson/mirror sieve-sift-0.1.2.tar.gz