Use SOURCE_DATE_EPOCH with GNU install

[Chris Lamb]

Ludovic Courtès wroteP

> > │ - Birth: 2020-07-20 09:02:11.688603176 +0000
> > │ + Birth: 2020-07-20 08:47:51.046971751 +0000
> 
> As you can see above, Nix resets the modification time (“mtime”) of
> installed files to the Epoch plus one second.
> 
> The creation time reported as “Birth” is an extension, not reported by
> stat(2), but fortunately it’s a piece of information that’s generally
> not used.
> 
> Perhaps diffoscope should omit the creation time by default?

It has done so since version 146, released in May 2020:

  https://diffoscope.org/news/diffoscope-146-released/


Best wishes,

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   o     o     reproducible-builds.org 💠
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