[Nix-dev] Updating stdenv on Darwin

[Ludovic Courtès]

Hello,

While building stdenv on x86_64-darwin, I noticed that one of Apple’s
upstream files had been modified in-place:

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This is not a problem on Hydra where everything is in cache, but it
prevents bootstrapping on another machine.

Thus I’d like to commit this patch and take this opportunity to update
Apple’s GCC fork as well.

Any objections?

Thanks,
Ludo’.