loongson/pypi: links for httpbenchmark

loongson/mirror httpbenchmark-0.5.tar.gz
loongson/mirror httpbenchmark-0.4.tar.gz
loongson/mirror httpbenchmark-0.3.3.tar.gz
loongson/mirror httpbenchmark-0.3.2.tar.gz
loongson/mirror httpbenchmark-0.3.1.tar.gz