Dart: Add support for aarch64-darwin

pkgs/development/interpreters/dart/default.nix

@@ -13,6 +13,10 @@
     version = "2.15.1";
   in
   {
+    "${version}-aarch64-darwin" = fetchurl {
+      url = "${base}/stable/release/${version}/sdk/dartsdk-macos-${aarch64}-release.zip";
+      sha256 = "sha256-DDE4DpA2m8wKkUZuQDn4NpXVvtaJ6sIHeKNjk3RbpYE=";
+    };
     "${version}-x86_64-darwin" = fetchurl {
       url = "${base}/stable/release/${version}/sdk/dartsdk-macos-${x86_64}-release.zip";
       sha256 = "sha256-s6bkwh2m5KdRr/WxWXwItO9YaDpp/HI3xjnS2UHmN+I=";
@@ -47,6 +51,7 @@ stdenv.mkDerivation {
     mkdir -p $out
     cp -R * $out/
     echo $libPath
+  '' + lib.optionalString(stdenv.isLinux) ''
     find $out/bin -executable -type f -exec patchelf --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) {} \;
   '';
 
@@ -63,7 +68,7 @@ stdenv.mkDerivation {
       with C-style syntax. It offers compilation to JavaScript, interfaces,
       mixins, abstract classes, reified generics, and optional typing.
     '';
-    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" ];
+    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
     license = licenses.bsd3;
   };
 }