Revert "remove obsolete stdenv darwinMinVersion override"

This reverts commit d91310b.

> Some packages require setting a non-default deployment target
> (or minimum version) to gain access to certain APIs. You do
> that using the darwinMinVersionHook, which takes the deployment
> target version as a parameter.

-- https://github.com/NixOS/nixpkgs/blob/60b54c7aee3c0cefde72d1a151bb7d3a46361ca2/doc/stdenv/platform-notes.chapter.md#what-is-a-deployment-target-or-minimum-version-sec-darwin-troubleshooting-using-deployment-targets

This will again solve error:

    ../nix_api_expr.cc:38:18: error: aligned allocation function of type 'void *(std::size_t, std::align_val_t)' is only available on macOS 10.13 or newer

-- https://hydra.nixos.org/build/294088946

Author: roberth

flake.nix

@@ -171,7 +171,7 @@
               {
                 otherSplices = final.generateSplicesForMkScope "nixDependencies";
                 f = import ./packaging/dependencies.nix {
-                  inherit stdenv;
+                  inherit inputs stdenv;
                   pkgs = final;
                 };
               };

packaging/dependencies.nix

@@ -1,14 +1,33 @@
 # These overrides are applied to the dependencies of the Nix components.
 
 {
+  # Flake inputs; used for sources
+  inputs,
+
   # The raw Nixpkgs, not affected by this scope
   pkgs,
 
   stdenv,
 }:
 
+let
+  prevStdenv = stdenv;
+in
+
 let
   inherit (pkgs) lib;
+
+  stdenv = if prevStdenv.isDarwin && prevStdenv.isx86_64 then darwinStdenv else prevStdenv;
+
+  # Fix the following error with the default x86_64-darwin SDK:
+  #
+  #     error: aligned allocation function of type 'void *(std::size_t, std::align_val_t)' is only available on macOS 10.13 or newer
+  #
+  # Despite the use of the 10.13 deployment target here, the aligned
+  # allocation function Clang uses with this setting actually works
+  # all the way back to 10.6.
+  darwinStdenv = pkgs.overrideSDK prevStdenv { darwinMinVersion = "10.13"; };
+
 in
 scope: {
   inherit stdenv;