feat: Add loongarch64 support

[wojiushixiaobai]

• https://github.com/wojiushixiaobai/sccache/actions/runs/24119407953/job/70370082013

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.23%. Comparing base (d11e2e0) to head (1bd7699).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2669      +/-   ##
==========================================
- Coverage   74.17%   73.23%   -0.94%     
==========================================
  Files          70       70              
  Lines       39207    39207              
==========================================
- Hits        29083    28715     -368     
- Misses      10124    10492     +368     

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[sylvestre]

thanks