Fix a Windows/PyPy3 test failure (#1533)
Fix a Windows/PyPy3 test failure (#1533)

PyPy3 on Windows has a test failure in `test_cmdline:test_outfile()`
when trying to unlink the temporary output file. The root cause is that
`cmdline:inner_main()` does not explicitly close the file that it opens,
and PyPy3 isn't auto-closing the file when `inner_main()` returns.
This prevents the file from being unlinked, and the test case fails.
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