loongson/pypi: links for forwardable

loongson/mirror forwardable-0.4.1.tar.gz
loongson/mirror forwardable-0.4.0.tar.gz
loongson/mirror forwardable-0.3.1.tar.gz
loongson/mirror forwardable-0.3.0.tar.gz
loongson/mirror forwardable-0.2.1.tar.gz
loongson/mirror forwardable-0.2.0.tar.gz
loongson/mirror forwardable-0.1.1.tar.gz
loongson/mirror forwardable-0.1.0.tar.gz