Revert "Fix Darwin stdenv to work on 10.13 (backport to 17.03)" #27807
+13
−42
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Reverts #27630
Caused too much trouble and would be a lot of effort to backport a bunch of LLVM 4 changes to the 17.03 release just to get fresh Nix builds. I'm giving up on this; if we want a Nix that works on 10.13, we should just bump the nixpkgs it builds against.
cc @edolstra @LnL7 @grahamc