windows: add GetFileTime

[aisk]

Add a simple Windows API GetFileTime.
The document is https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfiletime

Fixes golang/go#21541

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Message from Gopher Robot:

Patch Set 1:

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Message from 安龙（asaka）:

Patch Set 2:

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Message from Alex Brainman:

Patch Set 2: Run-TryBot+1

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Patch Set 2:

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Message from Gopher Robot:

Patch Set 2: TryBot-Result+1

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Message from Alex Brainman:

Patch Set 2: Code-Review+2

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Message from Alex Brainman:

Patch Set 2:

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Message from Ian Lance Taylor:

Patch Set 2: Code-Review+1

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Message from Michael Pratt:

Patch Set 2: Auto-Submit+1 Code-Review+1

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This PR is being closed because golang.org/cl/528015 has been merged.