cl: embed struct / interface support __llgo_va_list

[visualfc]

fix embed struct method has __llgo_va_list

type My struct {
    *py.Object
}

• struct embed call __llgo_va_list
• interface call __llgo_va_list

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (849b230) to head (fd17a43).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1282   +/-   ##
=======================================
  Coverage   90.16%   90.17%           
=======================================
  Files          42       42           
  Lines       11786    11796   +10     
=======================================
+ Hits        10627    10637   +10     
  Misses       1026     1026           
  Partials      133      133           

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