kind2: fix build

pkgs/development/compilers/kind2/default.nix

@@ -3,7 +3,6 @@
 , fetchCrate
 , stdenv
 , darwin
-, fetchpatch
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -21,33 +20,6 @@ rustPlatform.buildRustPackage rec {
     darwin.apple_sdk_11_0.frameworks.Security
   ];
 
-  postPatch =
-    let
-      hvmPatch = fetchpatch {
-        name = "revert-fix-remove-feature-automic-mut-ptr.patch";
-        url = "https://github.com/higherorderco/hvm/commit/c0e35c79b4e31c266ad33beadc397c428e4090ee.patch";
-        hash = "sha256-9xxu7NOtz3Tuzf5F0Mi4rw45Xnyh7h9hbTrzq4yfslg=";
-        revert = true;
-      };
-    in
-    ''
-      pushd $cargoDepsCopy/hvm
-
-      oldLibHash=$(sha256sum src/lib.rs | cut -d " " -f 1)
-      oldMainHash=$(sha256sum src/main.rs | cut -d " " -f 1)
-
-      patch -p1 < ${hvmPatch}
-
-      newLibHash=$(sha256sum src/lib.rs | cut -d " " -f 1)
-      newMainHash=$(sha256sum src/main.rs | cut -d " " -f 1)
-
-      substituteInPlace .cargo-checksum.json \
-        --replace "$oldLibHash" "$newLibHash" \
-        --replace "$oldMainHash" "$newMainHash"
-
-      popd
-    '';
-
   # requires nightly features
   RUSTC_BOOTSTRAP = true;