loongson/mirror: links for pyvtk

loongson/mirror PyVTK-0.5.18.zip
loongson/mirror PyVTK-0.5.18.tar.gz
loongson/mirror PyVTK-0.5.17.zip
loongson/mirror PyVTK-0.5.17.tar.gz
loongson/mirror PyVTK-0.5.15.zip
loongson/mirror PyVTK-0.5.15.tar.gz
loongson/mirror PyVTK-0.5.14.tar.gz
loongson/mirror PyVTK-0.4.85.tar.gz