loongson/pypi: links for pyqt3d-qt

loongson/mirror PyQt3D_Qt-5.15.2-py3-none-win_amd64.whl
loongson/mirror PyQt3D_Qt-5.15.2-py3-none-win32.whl
loongson/mirror PyQt3D_Qt-5.15.2-py3-none-manylinux2014_x86_64.whl
loongson/mirror PyQt3D_Qt-5.15.2-py3-none-macosx_10_13_intel.whl