loongson/pypi: links for steelscript-steelhead

loongson/mirror steelscript.steelhead-2.0.tar.gz
loongson/mirror steelscript.steelhead-0.7.1.tar.gz
loongson/mirror steelscript.steelhead-0.7.tar.gz
loongson/mirror steelscript.steelhead-0.6.tar.gz
loongson/mirror steelscript.steelhead-0.6rc1.tar.gz
loongson/mirror steelscript.steelhead-0.5.0.tar.gz
loongson/mirror steelscript.steelhead-0.5.0rc1.tar.gz