loongson/pypi: links for pymupdf

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

loongson/pypi PyMuPDF-1.24.9-cp39-none-linux_loongarch64.whl
loongson/pypi PyMuPDF-1.24.9-cp310-none-linux_loongarch64.whl
loongson/pypi PyMuPDF-1.19.6-cp38-cp38-linux_loongarch64.whl
loongson/pypi PyMuPDF-1.19.6-cp37-cp37m-linux_loongarch64.whl
loongson/pypi PyMuPDF-1.14.0-cp37-cp37m-linux_loongarch64.whl