loongson/pypi: links for krovetzstemmer

loongson/mirror KrovetzStemmer-0.8.tar.gz
loongson/mirror KrovetzStemmer-0.7.tar.gz
loongson/mirror KrovetzStemmer-0.6.tar.gz
loongson/mirror KrovetzStemmer-0.5.tar.gz
loongson/mirror KrovetzStemmer-0.4.tar.gz
loongson/mirror KrovetzStemmer-0.3.tar.gz