Android example with MLC-LLM can't build with mlc-llm nightly package on MacOS x86-64

[WuhanMonkey]

System Info

MacOS x86-64

AMD GPU

Information

• [X] The official example scripts
• [ ] My own modified scripts

🐛 Describe the bug

The nightly pip package for mlc-llm and mlc-ai on py311 MacOS x86-64 is old that the mlc-llm CLI doesn't include package as a command argument.

For users on these machines, they will need to build from source.

I think we should update the demo instructions here to explain this clearly.

Error logs

command

python3 -m mlc_llm package --package-config mlc-package-config.json --output dist

output

------------------------- Usage -------------------------
usage: MLC LLM Command Line Interface. [-h] {compile,convert_weight,gen_config,chat,serve,bench}

positional arguments:
 {compile,convert_weight,gen_config,chat,serve,bench}
                       Subcommand to to run. (choices: compile, convert_weight, gen_config, chat, serve, bench)

options:
 -h, --help            show this help message and exit
------------------------- Error -------------------------
argument subcommand: invalid choice: 'package' (choose from 'compile', 'convert_weight', 'gen_config', 'chat', 'serve', 'bench')

Expected behavior

The command should work as expected to produce binaries.