fix: when running in a headless process in win32 the lack of process.…

[ceottaki]

…stdin throws an error.

Fix #4870

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[ceottaki]

I signed it!

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CLAs look good, thanks!

[hansl]

I think this check is an error; don't you want to set it to process.input on linux/mac?

[ceottaki]

You are correct, this is residual from a different approach I had to start with. I'll remove the incorrect check for the platform, thanks.

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