use bzip2 compression on archive

Author: pmp-p

python-wasm-sdk.sh

@@ -32,7 +32,7 @@ then
 <a href=python-wasm-sdk-stable.tar.gz>python-wasm-sdk (emsdk tot, python 3.11b1)</a>
 </html>
 END
-        tar -cpR emsdk devices/* prebuilt/* > sdk/python-wasm-sdk-stable.tar
+        tar -cpRj emsdk devices/* prebuilt/* > sdk/python-wasm-sdk-stable.tar.bz2
     else
         echo " cpython-build-emsdk-deps failed"
         exit 2