[babel-cli] Don't fail when chmod throws an error

[immitsu]

Q	A
Fixed Issues?	Fixes #12835
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

[nicolo-ribaudo]

Thanks!

[codesandbox-ci]

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[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/41750/

[fedeci]

To test it:

it("should warn the user if chmod fails", () => {
  const spyConsoleWarn = jest.spyOn(console, "warn");
  // should expect a string as first argument
  chmod(100, "file.js");
  expect(spyConsoleWarn).toHaveBeenCalledTimes(1);
  spyConsoleWarn.mockRestore();
});

[immitsu]

@fedeci Added it, thanks!