Fetch system from `stdenv.hostPlatform`

The top-level `system` attribute has been deprecated for quite a
while. See

  https://github.com/NixOS/nixpkgs/commit/4246d6ce21d2d8d33e2d30f42b3d9d446c5dc143

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index bfb0b77..66ba60b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,7 +19,7 @@
   {
     overlay = final: prev:
     let
-      system = final.system;
+      system = final.stdenv.hostPlatform.system;
       darwinOptions = final.lib.optionalAttrs final.stdenv.isDarwin {
         buildInputs = with final.darwin.apple_sdk.frameworks; [
           SystemConfiguration