haskell.compiler.ghc966: init at 9.6.6

https://www.haskell.org/ghc//blog/20240701-ghc-9.6.6-released.html

pkgs/development/compilers/ghc/9.6.6.nix

···
+import ./common-hadrian.nix {
+  version = "9.6.6";
+  sha256 = "008f7a04d89ad10baae6486c96645d7d726aaac7e1476199f6dd86c6bd9977ad";
+}

pkgs/development/compilers/ghc/common-hadrian.nix

···
            then ./docs-sphinx-7-ghc98.patch
            else ./docs-sphinx-7.patch )
         ]
-        ++ lib.optionals (lib.versionAtLeast version "9.6" && lib.versionOlder version "9.8") [
+        ++ lib.optionals (lib.versionAtLeast version "9.6" && lib.versionOlder version "9.6.6") [
           (fetchpatch {
             name = "fix-fully_static.patch";
             url = "https://gitlab.haskell.org/ghc/ghc/-/commit/1bb24432ff77e11a0340a7d8586e151e15bba2a1.diff";

pkgs/top-level/haskell-packages.nix

···
       buildTargetLlvmPackages = pkgsBuildTarget.llvmPackages_15;
       llvmPackages = pkgs.llvmPackages_15;
     };
+    ghc966 = callPackage ../development/compilers/ghc/9.6.6.nix {
+      bootPkgs =
+        # For GHC 9.2 no armv7l bindists are available.
+        if stdenv.hostPlatform.isAarch32 then
+          packages.ghc928
+        else if stdenv.hostPlatform.isPower64 && stdenv.hostPlatform.isLittleEndian then
+          packages.ghc928
+        else
+          packages.ghc924Binary;
+      inherit (buildPackages.python3Packages) sphinx;
+      # Need to use apple's patched xattr until
+      # https://github.com/xattr/xattr/issues/44 and
+      # https://github.com/xattr/xattr/issues/55 are solved.
+      inherit (buildPackages.darwin) xattr autoSignDarwinBinariesHook;
+      # Support range >= 11 && < 16
+      buildTargetLlvmPackages = pkgsBuildTarget.llvmPackages_15;
+      llvmPackages = pkgs.llvmPackages_15;
+    };
     ghc96 = compiler.ghc965;
     ghc981 = callPackage ../development/compilers/ghc/9.8.1.nix {
       bootPkgs =
···
     ghc965 = callPackage ../development/haskell-modules {
       buildHaskellPackages = bh.packages.ghc965;
       ghc = bh.compiler.ghc965;
+      compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-9.6.x.nix { };
+    };
+    ghc966 = callPackage ../development/haskell-modules {
+      buildHaskellPackages = bh.packages.ghc966;
+      ghc = bh.compiler.ghc966;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-9.6.x.nix { };
     };
     ghc96 = packages.ghc965;