feat: New nitro binary file for older CPU generation

[hiento09]

Problem
Some users now use older generation of CPU, we need to build an additional nitro bin file for these machines end integrate that to Jan App

Success Criteria

• a new bin file for nitro with older version of CPU suppored
• intergrate to Jan app successfully

[hiento09]

Close this ticket since LLAMA_AVX and LLAMA_AVX2 is enable by default in llamacpp if LLAMA_NATIVE=OFF #368

[tikikun]

doesn't seem it working @hiento09

[hiro-v]

Closing in favor of #463