[issue16170] remove Linux skip from test_subprocess's test_executable() test

[Antoine Pitrou]

Antoine Pitrou added the comment:

Try prefixing "doesnotexist" with the same dirname as sys.executable
(i.e. `os.path.join(os.path.dirname(sys.executable), "doesnotexist")`).

Python under Unix uses its own path to determine where the standard library is, and it does so by inspecting argv[0].

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nosy: +pitrou

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