MinGW build is broken again #14662
Description
Describe the bug
Steps To Reproduce
https://hydra.nixos.org/job/nix/master/buildCross.nix-expr.x86_64-w64-mingw32.x86_64-linux
Expected behavior
Hydra builds MinGW fine.
A gazillion regressions from #14652, #14649 and #14640.
Metadata
Additional context
Checklist
- checked latest Nix manual (source)
- checked open bug issues and pull requests for possible duplicates
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