loongson/pypi: links for etecsa-sdk

loongson/mirror etecsa-sdk-1.6.tar.gz
loongson/mirror etecsa-sdk-1.5.tar.gz
loongson/mirror etecsa-sdk-1.4.tar.gz
loongson/mirror etecsa-sdk-1.3.tar.gz
loongson/mirror etecsa-sdk-1.2.tar.gz