qt6Packages: migrate to apple_sdk_11_0

pkgs/top-level/all-packages.nix

@@ -22639,6 +22639,7 @@ with pkgs;
 
   qt6Packages = recurseIntoAttrs (import ./qt6-packages.nix {
     inherit lib pkgs qt6;
+    stdenv = if stdenv.isDarwin then darwin.apple_sdk_11_0.stdenv else stdenv;
   });
 
   quark-engine = callPackage ../tools/security/quark-engine { };

pkgs/top-level/qt6-packages.nix

@@ -7,6 +7,7 @@
 { lib
 , pkgs
 , qt6
+, stdenv
 }:
 
 (lib.makeScope pkgs.newScope ( self:
@@ -24,6 +25,8 @@ let
 in
 
 (qt6 // {
+  inherit stdenv;
+
   # LIBRARIES
 
   inherit (kdeFrameworks) kcoreaddons;