loongson/pypi: links for py2wasm

loongson/mirror py2wasm-2.6.3.tar.gz
loongson/mirror py2wasm-2.6.2.tar.gz
loongson/mirror py2wasm-2.6.1.tar.gz
loongson/mirror py2wasm-2.6.tar.gz
loongson/mirror py2wasm-2.4.tar.gz
loongson/mirror py2wasm-2.2rc2.tar.gz
loongson/mirror py2wasm-2.2rc1.tar.gz