bug#29196: upstreaming of reproducibility related patches

[ng0]

Hi,

as I wrote in #29135, we should upstream the patches we
gather for reproducibility. Share with upstream what is
applicable to more software than just Guix included
definitions of the software etc.
Attached to it: the usual conversation, outreach,
public relations, discussions thing.

We have no list for this so far, so we should first
look into the patch-file patches (the obvious ones,
in gnu/packages/patches/), and after that into some
maybe not so obvious fixes we keep in the definitions
themselves (via substitute etc).
So we need a list, and then motivated people can work
on this. Even if people is just a couple. It helps.

We need to share this, to avoid duplicate work elsewhere.
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