[3.13] gh-109981: Resolve situation on iOS regarding fd_count. (GH-132823) #132824
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Modifies the test helper that counts the list of open file descriptors to use
the optimised
/dev/fd
approach on all Apple platforms, not just macOS. Thisavoids crashes caused by guarded file descriptors.
(cherry picked from commit 862fd89)
Co-authored-by: John johnzhou721@gmail.com