loongson/pypi: links for hexdump

loongson/mirror hexdump-3.3.zip
loongson/mirror hexdump-3.2.zip
loongson/mirror hexdump-3.1.zip
loongson/mirror hexdump-3.0.zip
loongson/mirror hexdump-2.0.zip
loongson/mirror hexdump-1.0.zip
loongson/mirror hexdump-0.5.tar.gz
loongson/mirror hexdump-0.4.tar.gz
loongson/mirror hexdump-0.3.zip