runtime/internal/lib/os: fix readdir for darwin-amd64

[visualfc]

fix #1232

github.com/goplus/llgo/runtime/internal/clite/os

Opendir
CloseDir
Readdir
Fdopendir

for darwin-amd64 linkname

fdopendir$INODE64
readdir$INODE64

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.80%. Comparing base (cf2d1ef) to head (69fe6d6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1240   +/-   ##
=======================================
  Coverage   87.80%   87.80%           
=======================================
  Files          35       35           
  Lines        8941     8941           
=======================================
  Hits         7851     7851           
  Misses        979      979           
  Partials      111      111           

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