loongson/pypi: links for x4c

loongson/mirror x4c-2025.9.10.tar.gz
loongson/mirror x4c-2025.9.1.tar.gz
loongson/mirror x4c-2025.8.22.tar.gz
loongson/mirror x4c-2025.8.21.tar.gz
loongson/mirror x4c-2025.7.9.tar.gz
loongson/mirror x4c-2025.6.22.tar.gz
loongson/mirror x4c-2025.6.14.tar.gz
loongson/mirror x4c-2025.3.20.13.tar.gz
loongson/mirror x4c-2025.3.20.tar.gz
loongson/mirror x4c-2024.8.24.tar.gz