`os.EX_OK` exists on Win32

[michaelmhoffman]

Running python.exe -m mypy . on a directory where there's a script with from os import EX_OK leads to an error on Windows:

pdfcomments\__main__.py:20: error: Module "os" has no attribute "EX_OK"; maybe "X_OK"?  [attr-defined]

stdlib/os/__init__.pyi contains a type hint for EX_OK that is guarded by an if sys.platform != "win32" block. However, since python/cpython@19459f8, EX_OK has been supported on Windows. It should be placed outside the guard block.

[AlexWaygood]

Thanks, your analysis looks accurate— PR welcome!

[sobolevn]

@michaelmhoffman I see your commit, but I cannot find a PR link :)
Looks like you didn't hit "Create PR" button.

[aminalaee]

With credits to @michaelmhoffman , created a PR for this.